Ok, I do have some feedback for you. 
Hello and thank you. This is a helmeted chameleon from Yemen,
the common name is veiled chameleon. Helmeted chameleons are trioceros hoehnelli and are from Africa. it's a male
His patterns do seem to indicate male and I think it's a subadult (I don't know his age).
My guess would be at least 6 months old I have had him for less than a week. I read that he's supposed to be pretty belligerent but he's very sweet,
They are known for having attitudes, but each is different I'm not really handling him right now but he's already come on my hand willingly. I feed him about 10 crickets a day,
You will want to cut back on the amount as he gets older. Full adults should be fed about 3-4 feeders every other day or even 3 times a week. I was thinking of giving him 3 locust a week or so and I was going to try to give him cockroaches or something.
He will enjoy the variety I give him his meal in two times by hand.
It’s best to feed once early in the day to give him time to bask and digest.I am French but you may know the brands. For calcium and vitamins it's the Trixy brand.
I don’t know those brands. You’ll want to use a calcium that does not have vitamin D3 for every feeding. I will give him calcium 2 or 3 times a week and vitamin about once a week.
Very important - does the multivitamin have D3 in it? If it does, you’ll use that for one feeding every other week. If it does not, you’ll need to get a calcium that has D3. Then one feeding every week you’ll alternate between using the multivitamin and the calcium with D3. So weeks 1&3, you use calcium with D3 and weeks 2&4 you use the multivitamin. For the watering it is automatic, 3 times 2 minutes.
Very good! There is also a drip system and I have seen him drink. His droppings have a fairly firm consistency
and are brown with a yellowish substance. As I have had him since very recently he has never been to the vet.
I always think it’s a good idea for a wellness vet visit and have a fecal check for parasites. It is winter so the lamp is on for eleven hours. His lounging spot is 72F.
This is too cool. Basking should be at least 80f and can be as high as 84-85f. At its lowest point in the evening it is 60.8F. The humidity downstairs is about 60% and a little less in water.
This is a bit high. Ideal daytime humidity is between 30-50%.
Uvb is very important. As I said earlier, T5 with a 5.0 or 6% uvb bulb is the standard as it provides adequate levels at a good distance as well as gradients and it’s output is pretty reliable. Screw in uvb have no range beyond 2”. Mercury vapor bulbs output isn’t reliable and a solarmeter is needed to find the correct area for ideal UV index of 3. Without correct uvb and vitamin D3, your chameleon won’t be able to use the calcium you’re giving and can suffer metabolic bone disease.
Your enclosure looks good, but the green hammock and yellow cord could trap his claws and damage them. Branches and vines are much safer and more natural for him. Also, it looks like you have a hide for him at the bottom. Chameleons live in trees exclusively and will never use a hide. Unless you have a fully bioactive set up, a bare floor is best with no substrate. You’ll also want to replace all of the artificial plants with safe live ones. Veileds like to nibble their plants and have been known to eat fake leaves and become impacted, which is pretty serious and requires quick veterinary care. I would suggest getting a tall center plant, like a schefflera or ficus benjamina and then have a few other plants surrounding it. You want to create a little forest edge. I use my artificial plants on the outside of the screen to provide my chams with a sense of more privacy. I can’t determine from your pics the size of your enclosure, but for an adult male it should be as large as possible. The minimum would be an XL Reptibreeze (2x2x4’) or equivalent. As your humidity is a bit high, I’d stay with all screen for better air circulation.
Getting everything correct is a process and while it’s best to have everything completed as soon as possible, the most important to address right now are correct uvb and supplements and basking temp. Do make sure to check out the Chameleon Academy link I gave and fully explore the site. There is also species specific information there. I’m attaching a safe plant list.
Do please ask as many questions as you need. Many/most of us here love helping new keepers.
