Coloured version of this:
[link]

Just practise at drawing Jigsaw, since I haven't drawn him seriously in ages. With SAW 4 coming out this month, I've got Jiggy on the brain recently.
Obligatory green tint, as all SAW movies seem to have.

Was also practise at drawing an old/sick/dying rat (because you won't get by in the art world if you can't draw one of those) since most of my characters are pretty healthy.
Old rats are like a species all of their own, anatomically. They tend to have really weak hind legs so they don't lift themselves off the ground much anymore, and they get what are termed 'match-stick' tails, which is basically where their tail stops being a nice smooth rounded shape and goes angular and, well, like a matchstick.

Kinda given up on getting him to look like a rex though, I don't know if convincing bald patches are possible in my kind of style. But he has curly whiskers, at least.