It looks all good to me, it was definitely not your fault that he past away. I guess you just happend to get a sick chameleon, sadly
Do you got drainage system from that misting system? You don't need one, but you should not have stained water in the cage. And a drain system would make it alot easier.
Do you got beliefe in the pet store you purchased your chameleon from or do you have another option to buy from? What I've learn is that you should always do your research or dubble check later when you get some information from the pet stores. I got lots of experience from pet stores that say things or trying to sell things that you don't need or are just completely wrong for a chameleon. For instant.
- Tried to sell me WAY TO BIG cricket for my guy, told me their chameleons at the same size ate that size of crickets.
- Tried to sell me a glas terrarium and said it was better than they screened one. (Screened tarrariums was cheaper)
With this I want to say that you should always be critical to what they say, keep in mind that they want to make as much money out of you as possible. And most bigger companies don't care if it will hurt the pet, just care about to make as much money as possible.
I hope this give you some kind of hope and help to get another cham, they are a joy full to take care of and see growing up.
Good luck, and if you got any other questions feel free to ask us and PM me if you want and I'll try to help you out
