It's where my demons hide

Finished coloring it!
MY DIGITAL DRAWING SKILLS ARE IMPROVING GREATLY AND I AM SO HAPPY
LOOK AT HIS HAIR. LOOK AT IT. I AM SO PROUD OF THIS. I HAVE NEVER BEEN ABLE TO COLOR SOMETHING THIS WELL BEFORE AND I HONESTLY DON'T KNOW WHAT I DID TO DO THIS.
HIS KAGUNE WAS REALLY DIFFICULT AND I SPENT LIKE TWO HOURS ON THAT ALONE AND I AM HAPPY WITH THE END RESULT.

I know that I am in no way perfect and this isn't nearly as good as a lot of other drawings I've seen. I know I still have a long way to go before I am really happy with my drawing style, blah blah blah there's always room for improvement. But dang I am pleased with this drawing.
One thing I am actually upset with, though, is the background. I feel like I need to add something on the other side but whatever I try doesn't look quite right. Any suggestions?