Demonic Influence

I know this one is coming a little late, but the one I was working on previously gave me quite of bit of trouble.  I had the idea for it, but after struggling for a few weeks, I just couldn't get it to come out in any satisfactory way.  I apologize for this and hope that it won't take as long for the next one!

Also, does anyone know of a decent photo editing app for phones/tablets?  If I can get a good one, I'd be able to work on these every once in a while during break at work.