Wow ... now that's green! :) This is a great idea, and I'm not adverse to reptile photos. This one has those really cool eyes that look in all directions. I think what happened here is your selective color and the hue/saturation. Sometimes when you bump the sat level too high, you get artifacts that are hard to get rid of. Also, this green (on the lizard and the leaves) looks really unnatural, and takes away from an otherwise nice photo. The leaves in the foreground that are OOF are a little distracting. My eyes want to wander over to them instead of looking at that awesome specimen of a reptile.
Overall, I think you had a great idea. Composition is good, as well as focus and interest. I just think you over-did the green a little in your attempt to make it stand out more. Hope this helps! :)
The color job you did is kind of weird. I would have like to have seen this in its natural colors maybe with a slight bump but not quite so much. I'll give you a 5.
I love the color of the chamellion in contrast to the leaves on your branches! It's a very nice green combination. Despite what others may think I also like the fact that the branch is out of focus. It adds a nice solorization feature to the picture that makes it kind of trippy. Awesome!