Hello,
Please do take a look at the beautifuldragons site. The feeding chart is very informative. Most likely your dragon was not fed much if any greens or veggies so it is an adjustment for him.
Do you know how old he is? He looks to be a juvie possibly 5-7 or so months? How long is he?
Use mustard or collard greens. Try some small pieces of fruit such as diced apples, sliced grapes or a few small pieces of melon mixed in or around in the greens or veggies to see if he likes that maybe he will grab a bite of veggies while he is at it. Worms such as butterworms or phoenix worms can also be mixed in too in order to entice him a little bit. Those 2 worms are loaded with calcium so they are good for him.
The supers are fine as well, but cut the mealies down & only offer those a couple of times per week & limit them. They are fatty & do not have much nutritional value to them.
What brand of UVB are you using, I did not see where you mentioned that? If you do have a compact or coil light that is not a good light. As suggested, the Reptisun 10 flourescent tube bulb is the best one.
What sized tank do you have? Overall, it is a good setup. The basking light, what type is that? You already have a ceramic based fixture light dome so you could use a mercury vapor bulb. The distance requirements are 12 inches for 100 watt mercury vapor bulbs, so you might need to adjust the distance for the basking, but it would be doable with your setup.
Tracie