Here's a somewhat more recent sprite I made for practice.  There's a pretty glaring error in the left one, though, and I'm only posting it to demonstrate something...

And here's where I realized that I need to give people longer legs!  A lot of my old sprites make the upper half too big, and put the knees too low.  So here's where I corrected it.

Also, this is just about the right sprite size for human-sized Doom enemies for the mod I'm making.  Though at the moment, I'm looking into weapon graphics.  So far, I've rotoscoped my hands, big whoop.