I'll bite.
There's waaaaaaaaaaaaaaay too many portraits to go through, so I'll just cover the most recent ones.
Anslo I quite like. Some portraits just blend together on IGS (particularly a lot of the Caldari girls, sadly), but I can always spot Anslo if I'm browsing through a thread. Distinctive and well put together without being too flashy.
Shin: There's just something off about the portrait when magnified. Can't put my finger on it.
Che: You look way more badass in the small version.
Blown up like that... it kind of screams 'teenager with rebellion issues'. Again, can't quite put my finger on what the specific issue is; maybe the hairstyle and bearing just doesn't quite seem to match with smooth face and half-smile. Although Lyn has a point about the eye wrinkles, so maybe I'm just being picky.
Korsavius I love. It's the face of someone with nothing to prove. He's quite happy just waiting for you to do something dumb. If you don't, great. If you do... run.
Sepherim... like Anslo, Sepherim stands out a bit on IGS, which is no bad thing. Does feel a tad generic, though. Basic character is good, portrait lacks any real depth.
Merd's girly: definitely an interesting experiment. Not bad.
Gabriel: Holyshitthoseeyes. I feel pinned to the spot by those things. Nice work.
Samira's cute. There's a nice bit of humility that fits with what little I know of the character, nice eye positioning.
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Clicky for larger version. Honestly it needs updating, but I keep putting it off because I like the pose, even if it does look slightly awkward if you look at it for too long. Reppy's amazing for WiS, actually - she somehow manages to appear bored and impatient the whole time, which fits her to a T
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I don't like Elysa, unfortunately. I did my best, but Carbon was extremely cruel to her. I'll be doing a rebuild and reportrait when I get to reactivating her account. Any thoughts?
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The original dude, who will likely never be reactivated now, so he's just around for posterity. I'm still bitter about my helmet. Despite the fact that I originally resolved never to show him without it, I think he turned out quite nicely.