^^Ok first off he needs a hide like this:
http://www.reptilebasics.com/hide-boxes/
They can be anything really. I use the things that catch the water under a pot. OR another thing for a bigger bp would to buy the cheap plastic flower pots and cut it to height.
One needs to be on the hot side and one needs to be on the cool side. Also what are you using for heating. And to add to all this where is your temp guage? Thermostat? And is that SAND?
Lose the plastic thing in the first pic on the left side. Put a hide on each end/corner and put the big tree and the water bowl in the center.
He is prob not eating cuz he doesn't feed secure with the lack of hides. OH and also he help add some more of that background to the sides of the tank too.