I've always been a fan of Brett Booth's work, even more so when I saw he worked on the awesome dinosaur comic Extinction Event (worth a look at!) So i sat down today and did a few studies of some of his dinosaur drawings, bare in mind these are referenced study's, so I hold no claim to any original work, I was just learning by doing and trying to understand his artwork a little better! Great fun to do, learned a fair bit. Why don't you go over and check out his dino blog? its awesome!