Saede: I like the eye color. The rest of the portrait is dark or done in cool colors, so the presence of warm yellow makes the eyes that much more vivid. I'm partial to Maori-style tattoos. The lips look a bit puckered, giving her an air of distaste.
Sid: The best part of this portrait is how the lip peircings fit the flow of the facial tattoo. The hairstyle gives a distinctly rebellious look. The clothing is drab, but it suits; it allows the focus to remain on the striking features of the face. The circle grill background is a bit distracting, though.
GoGo Yubari: The blush is overdone, and doesn't flatter a narrow and angular face. Zooming out to a body shot makes the eagle on the shirt the central focus of the picture, which is possibly your intent? I'm more likely to remember the character's shirt than what she looks like.
Veikitamo: It might be an effect of the lighting, but the eyes look very slightly cross-eyed. The deep shadow along the inner eye socket might be the culprit. Otherwise, the pose and the distant focus of the gaze fits the stated characterization. The colorfulness of the lips is a good contrast to a portrait that's mostly grey-scale.
Desiderya: This character has a narrow, sharp face and the hairstyle does a good job of emphasizing this. White hair's a bit of a risk, but fortunately the face and lips lacks strong color and so it fits. Might consider a more pallid complexion. The long zoom makes it hard to make out the character on smaller views.
Graelyn: The immediate reaction from this picture is that of an experienced, sharp and cynical character. Good work on the eyes, as it makes the character seem observant, rather than glaring at a singular point (as many Amarr males do). Good use of the age slider, which isn't used often.
Vaun: Looks like an Easter Islander statue dug itself out of the ground and found itself a space ship. Good take on an 'average-looking' person with a single, unnerving feature. Subdued symmetrical background seems to fit.
Aelisha: The mechanical eye matches the eye color of the organic eye well, providing a symmetry despite the difference. It feels like more can be done with the lighting, zoom, angle, and background to focus the attention on a rather striking face. White tattoo clashes with dark hair and clothing, not necessarily in a good way.
Nmaro: The zoom-out level detracts quite a bit from the portrait, especially given how miniature the face can be on the smaller views. I think more of an angle would fit this character better, especially with the ponytail/knot in the back of the head. I'd look into the color balance of the lips, tattoo and eyes, as they don't fit well together..
Kala: Not many profile portraits out there, which gives her quite a bit of uniqueness. Freckled redhead, as common an archetype as it is, works rather well. I like blue or green in combination with that complexion rather than black. As such, I'm more partial to the second portrait with the blue tattoo. I'm not sure black lipstick is a good choice here.
Silas: A color-drained white hair + white outfit + white eyes approach is a good one. But I think you undermine that with the pink make-up / lipstick. Having the character look up can make her seem more aloof or proud. But in this case, it just looks like she's looking up at the ceiling (especially since the absence of pupils makes the object of her focus unclear). I'd work on the angle of the face some more, and perhaps zoom in a bit.
Istvaan: The dramatic lighting and the half-shadowed face works well, particularly for a character with a shady air to him. I think the bright blue event horizon background detracts from this approach, though, as much as it provides a sharp relief to the face. Something darker, perhaps.
Kentt: This character has a good, unique look. The lighting choice fits well with the tatoo color. I'm not sure what kind of outfit you have, but the chainmail texture gives it a retro, somewhat primitive look - in a good wa. Scruffy hair, scruffy chin, and earring all complement each other.
Ghost: Looks stiff and robotic, which is probably the intent. The unity of the green color scheme works well, and the tattoos add to the artificial/mechanical quality of the character. The shoulders should be more square than sloped, but not sure what you can do there aside from an outfit change.
Lynn: I think the blush and makeup should be toned down or changed to the brown hue. The natural skin tone and hair combination is a good one, and the plain top adds to the portrait's overall simplicity. The lower half of the face seems a little too small, with the mouth utterly dwarfed by the nose. It could be a bad angle.
Laerise: Normally, I want the face to be the primary focus of the portrait. But in context of the Amarr logo and the 'disgusting heathen' squint, the camera angle isn't bad. I like the level of expressiveness, which you don't see much elsewhere. Consider one of the 'royal' haircuts with the bound up braids.
Norrin: Looks distant and smug, particularly with the shades. That impression has something to do with the lips, which seem tight and pursed. The zoom-out makes it fairly difficult to make out more about the face, especially on smaller views. As is, it looks like a generic man in shades.
Yuni: Color choices work well. The lip piercings and the mime eyeshadow make for good symmetry. The blush is just right for this character.
Rok: The earthy tones match this character's name. With the full-down dreads and the wide chin, I think the angle could better selected. This is a character that should take up most of the screen.
Dilaro: This character has some really prominent cheekbones, which distract me from the rest of the face. The scar is a good fit with the white hair and aged features. I can't see much else past the cheekbones, though.
Jev North: Simplicity works well for this portrait. It's not very busy, allowing for some good chiascurro between the light complexion and hair, and the deep shadows and dark colors of the outfit. The drawn back camera and the character's vague 'off-to-the-side' perspective, however, blunts the sharpness of the portrait.
Gotti: This is a great profile portrait. Even though the head leans forward, the eyes stare straight ahead, giving the charactger a very focused look. Beard, dark dreads, and tattoo give him a lot of character, and the plain shirt keeps the focus on the face.
My counter's up, so I'll continue later.