Cool Concept, need more studying!
You have a neat idea here, and a lot of parts of the picture are good, but there are many flaws that you will be able to overcome with practice.
With the protagonist (I assume), I see both of his feet are planted on the ground. This makes for a very static pose, and overall he seems a little apathetic. A more aggressive line of action for the poor guy would improve the picture overall.
Some more enviromental detail, better realised structure of all characters and recalculated perspective are what you need to improve on your production skills.
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