I cannot work on this anymore for the life of me ;-;

I had this like 90% done before I left on my trip a month ago, and for the past few days I've been picking at it for a couple hours a day. This was a real challenge because I'm not used to playing with dramatic lighting or colors, at all. I have no formal education or practice in them so I don't know what I'm doing basically but I tried.

If anyone has any tips, critiques or suggestions, please share!

Anyway, this is my half of an art trade with  Torrential! 'Tis her sexy dragonsona, Dexian.