Alright I'll have a shot at this

However, that being said, I am not a photoshop pro/guru so this is just my personal opinion. Anyway here goes, I think that the focal point is too bland compared to the vibrant colors shooting from out behind him. I also think that the rest of the sig is lacking motion (don't know if that is the right word to use, perhaps action?).
Once again this is just my opinion and only what I would like to see improved. I am by no means a photoshop master and handing out expert advice. Hope that helps