This is a magnificent piece
great depth and intensity.The only thing I might do differently or see what it would look like is change the color on the red background.this might stand up and pop the Darth Maul character
outside of that I wouldn't touch a thing. Did you try cropping the image perhaps cutting up to a quarter of the image , I am sure you don't want to put darth in the middle but it might be something to look at .
You have done a great job and may have already tried the things i have suggested . Remember these are suggestions not demands, never compromise your own eye or feelings no matter what people say. Especially from someone who is clearly a novice by comparison