And, if you would be so kind as to point out which ones in particular. I've personally had it in mind to tweak #2, 4, 5, and 6. The "technique" developed as I did more of them, which makes an interesting scenario where the quality increases as you go from left to right, haha. Does the same criticism apply to images from within the game? The ones above are not randomized, after all.
1: Slightly off, looks a bit too strained.
2: Seems okay. Not perfect, but okay. Slightly dead look.
3: Looks pretty good.
4: Bit too small. Don't have the "dead" look though.
5: Definitely looks dead.
6: Looks great.
7: Looks great. Not quite as good as 6, but still great.
8: Looks a bit strange due to being almost closed.
9: Looks great. The left eye does slope a bit much though.
10: Looks good.
11: Dead
12: Dead
13: Look alive, but too slanted
Does that help?
"Does the same criticism apply to images from within the game?"
The portraits definitely look much more real than vanilla, and that's part of the problem. It looks real enough that small things, like the eyes, can make the entire thing seem off. The uncanny valley as I referenced earlier.
Vanilla doesn't have this problem, as the portraits aren't realistic.