I'm fairly new to this forum.. but one thing I noticed in your enclosure is a small bowl of water towards the left side of the picture... that's not needed nor is it recommended.. chams don't drink from dishes.. they will lick water from dripping leaves.. another thing is no ventilation at all in there.. I started with a veiled about 2 years ago and found that when they are rubbing their eyes/faces on objects there was usually one of two issues that were causing it..1. humidity numbers you posted are fine.. but the amount of "true" moisture was not good.. there's not enough to keep them from "feeling" dry.. how often and for how long do you actually mist the enclosure?? 2. I have been informed (and have experienced) that veiled are extremely susceptible to eye issues/infections... unfortunately that was the case with mine.. she had developed a serious eye infection... her eating (on her own) had ceased due to lack of vision and inability to aim correctly... so in an effort to save her I had drops to administer and ended up having to literally hand feed her for several months before I lost her..
in keeping with the enclosure issue.. there are those whom swear by screen only.. and there are those whom say glass is fine as long as there is ventilation... then there is the amount of space that seems to be in great debate as well... im not "experienced" enough to definitively say one way or another.. however by my own thoughts and experiences with the chams I have now it can go either way as long as they are happy... I constructed a 4ft X 4ft X 2ft glass/wood/screen enclosure for them to live in... plenty of climbing vines and plants... automatic misting system... plenty of climbing and roaming room.. and against all information/advise (seen on here and per the research I've done) I have more than one in the same home and all seem to be happy and relaxed.. since I've done all this I have not seen any health issues, stress problems or lack of interest in eating or drinking...
Again.. this is just my own experiences and thoughts... however the biggest issue for you is the housing... more ventilation, loose the water dish (and the food dish in the back is not really needed either), loose the bedding (I have reptile carpet.. seems to work fine), as far as the "decorations" for the tank.. plenty of climbing vines and green for hiding... with those simple changes you should have better luck with him...