I had doubts about some of them because the image must be a portrait. It would be nice if an admin could tell me whether #2 and #3 would be acceptable avatars.
The Old Lady (current)
This one is funny because it looks like he is looking up at the above post.
The Baby Snatcher
This was actually derived from a portrait. The old guy was putting the baby over a ledge for a photo, and I just rotated the image.