How large are the crickets you feed him? I’ve attached the feeder and gutload charts below. Has he ever been to an experienced chameleon vet before? His misting sessions should be a minimum of 2-5+ minutes each time, preferably only in the morning and at night when the cage is cooler, if your humidity levels allow it. Also, his daytime humidity levels need to be between 30-50%. What your daytime humidity levels are right now are what his nighttime humidity levels should be. How far away is his basking branch from his heat and UVB bulbs (what strength and brand of fixture and bulb do you have for your UVB)? His basking temp needs to be measured with a digital thermometer with a probe, with the probe placed where his casque/top of his back is when he’s on his basking branch. The Exo Terra vines need to be removed and replaced ASAP as well! They can cause health issues with the debris that comes off of them. If the substrate isn’t bioactive, it needs to go ASAP, too, as it’s an impaction risk (as well as the fake plants, too, but you can hang the fake plants on the outside of his cage for added privacy)! For your cage, it needs TONS more plants (all live chameleon-safe and veiled-tested, I posted two charts below for them, also make sure to properly clean the plants off beforehand, too), multiple species and diameters of branches (no moss-covered dowels or branches from toxic or sap-producing trees), and vines (preferably all live, but fake ones that aren’t moss or Exo Terra can work if needed, like Fluker’s vines). This website has the most accurate and up-to-date info, so make sure to read through every module and the veiled species profile, as well as listen to as many podcasts as possible, from them!
https://chameleonacademy.com/chameleon-husbandry-program-getting-started-with-chameleons/
https://chameleonacademy.com/veiled-chameleon-care/
And here are two great cage set-up links!
https://chameleonacademy.com/setting-up-a-chameleon-cage/
http://www.muchadoaboutchameleons.com/2012/04/how-to-set-up-proper-chameleon.html
Here’s a great plant link, as well!
https://chameleonacademy.com/plants/