visual art Does the moon forgive the fallen?

[Akari of Duskshire 581]

I get these images in my head and I just have to draw them.  I figured I could try lighting in this one.

 

What do you think?  What should I improve on?  I know I'm not the best artist in the world and I'm always striving to get better, so I'd appreciate some tips.  Keep in mind, I use an Intuos Pro tablet with a pen and AutoCAD SketchBook.