People - men and women, though I tend to favor women. I enjoy doing faces alone, and also figures. I've never worked with a live model - I'm sure it would be very interesting!
Sometimes I try to be as realistic and portrait-like as possible, and other times I have gone over into fantasy and had fun with faeries & the like. I even did a half-decent dragon once, but I get the most pleasure out of creating new people on paper. Creepy, eh?