I just spent 5 minutes trying to decide whether I like the blue background, and I think yes. I like how it clashes with the bright green of the chameleon!
Hope you don't mind a little CC. I really like the pose, lighting, & background, but I think it would look a bit better with about 1/3 less exposure, and about 2 stops more depth. What is in focus has really nice, crisp scale detail, but I would liked to have seen more of it.