Healthy weight? Or no?

[Moofins07]

I have a young ball python (yet to be sexed, but I'm 80% on it being a male) and I was just wanting to make sure he's at a healthy weight. I can't take any decent pictures right now, but he's 3 months old, approximately 15-16 inches long, and he looks to be about one inch thick at the widest point of girth.

Does this sound fat enough? He's one day away from feeding, and now that I look at the hopper we bought today, it seems so tiny. He absolutely refuses to eat anything f/t, sadly. Should I go ahead and feed him one day early, and continue to do so until he gains some weight?

Also, a couple quick questions: is an under-tank heater and one heating rock good enough? And to raise the humidity, do you just give the sides of the tank a quick spray each day? I hope I don't sound to noobish with these questions.

Any thoughts and suggestions would be so, so helpful. I just want to make my little serpent as happy as possible. Thank you!


(Edit): I just remembered that I do have a ton of pictures of him on my Facebook, so I'll add those now.