These were fun because it started to get into what most background artists work with-namely combining some photographic, some painting, and some 3d. I was given a 3d model, and did my best to combine it. Nothing like spending time at work searching on flicker for pictures of bloody wounds that I could merge into a dinosaur.
And the finish. In the final movie they ended up doing a zoom out from this image, which I think worked nicely but didn't give it as much screen time. With the 10 second holds they had on some of the other mattes, I could live with that.