I just remembered that my game Before the Faire was inspired by a set of anime character portraits in the first place. They're not mine, though, you can find them here and here. But the game wouldn't exist without them. Credit where credit is due.
Edit: come to think of it, the way inspiration worked was quite interesting: because I was limited to what was already available, even the personalities of the characters are based on what facial expressions were available for each of them...