It's a good idea to get some cheap dinos for this kind of enterprise. It's always amazing, how a little paint here and there makes even these models look like something.
I wholly agree with giving the dinos a little color. Did you actually highlight the blue? Maybe the photo doesn't show it but it looks very - two dimensional. Maybe a lighter blue would bring even more life into that part.
I like the idea of hiding the badly cast claws behind some foilage. Must remember that...