Had a quick mess around with this, hope you don't mind.
You have a nice spiral composition, and have tried cropping it to accentuate that shape, and make the main character less centrally placed.
Lightened it overall to help separate shapes, also made an extra pass over the cyclops guy in the background as he was blending into those either side of him.
Lastly that blue on the left is really distracting, to the point where it is drawing the eye more than the green in the armoured figure.
Just my thoughts, I'm no expert, but I hope I've been useful.