Cherron is right. You may think you are providing the cham with more freedom, but you may actually just depriving it of good husbandry.
Where are the UV lights? Your cham will die a slow, painful death without UV exposure (unless you go the risky route of trying to balance it's supplements just perfectly).
The cham is not protected from the basking light. It could easily get burnt if it ever decides to climb onto the lamp as a means of escape (and it may not do so now, but when it gets older it will develop a wanderlust and try to leave the tree).
Also the basking light seems too low. Chams feel most secure when they are high, so a high basking light would allow it to bask in a place where it feels more secure.
Also, you may think that it is a big tree, but it is actually quite small in comparison to a suitable wild habitat. The foliage isn't very dense, and I can't imagine that it actually feels very secure in that thin bush in the middle of your room.
All of the problems I have mentioned above (including the humidity/watering issues that Cherron discussed) are some of the main reasons people don't free range their chams. It becomes very difficult to apply the correct husbandry in a free range environment.
It's far easier to provide a secure environment, where you can satisfy all the cham's needs in a cage or other type of enclosure. It's not impossible to free-range, but it is difficult, risky and demands that the keeper is experienced.
Hopefully I am wrong and that you haven't neglected the husbandry needs that I've brought up, but I can't see any evidence of that from those photgraphs.
