A few questions for a newb

[Kimo]

hey guys, i recently aquired a veiled at the PCP show on the 23rd, and it seems my lil guy is doing fine, he wont stop eating, every day anywhere from 10-20 dusted crickets, of medium size, and has grown rather fond of ripping apart a good size lettuce leaf, now my question is, everytime he is in his enclosure, he seems to be rather dark of skin (put a blue panther to shame) and from what i've heard this means they are stressed? however when i pull him out every day to let him play on my hand, he goes a nice vibrant green, now just to answer and eliminate some of your potential questions, he is in a low traffic area (next to no traffic at all, other than me coming to check in on him) and there are also no mirrors or reflective surfaces of any sort near him aswell, he has also shed twice since i got him, and has almost doubled in size since i obtained him, he gets a daily misting once in the morning, twice in the afternoon, and 2 hours before lights out, if anyone could suggest possibly why he chooses to be coloured this way, or how i can correct it (if its a problem) i'd greatly appreciate it, and oh THANX ICULIZARD!!! i love my lil guy

thnx for your help guys/gals

Kimo