A lot of artists tend to but out a decent amount of sketches and colored images, but from exploring Dan Hipps site I'd say he's constantly drawing something. Oh the dream of drawing all day. At any rate I came across Dan's site and found a good mix of funny and serious art that he has on display. I've stuck to the comic themed drawings, but if you're interested in seeing more than explore his site. You won't be disappointed.
Be sure to check out Dan's site for more awesomeness!