Thanks, Rich! Your sculpts set the bar for me - I hope to get near your level someday, so that is very much appreciated!
As for color: I'll probably do them in a variety of browns and greens and patterns. I've saved lots of pictures of reptiles and turtles for inspiration, and pics of the JP Rex & raptors as well. I'd love to have four that are distinct enough despite using the same sculpt that they could represent the four characters.