Composition in general is good. Maybe touch of crop from the right. I dont like branch in the background. Photoshop could help. Possibly I would compose it as top of the lizzard muzzle is clean. Bark - Lizard. This approach could help to have feeling of crawling - lizard have short lengs. Now you have a bit of bark behind. I know it is very difficult to think about all these things in action
Interesting texture on both, somehow works well together. Propably it supposed to

Well metered and exposed.
Last though - maybe it could be better to show mroe leg, now it seems to be a separate bit
Regards,
K.Polak