TMNT - GARGOYLES

This is a project I've been working on for a while, it's one of the first pics I did for this collaboration, the new ones are turning out better. My partner and I decided to make a crossover of Teenage Mutant Ninja Turtles and Gargoyles, I'm doing all the artwork and he's working on the story. It was my idea, but I needed help with a story for it and that's where he comes in. I'll be posting the new pics up soon, still trying to perfect the look of things, this first pic shows me where I need to improve.