I like what I see, but I see some issues too, that you might want to address: Circular text is too close to the frame on both front and back. King Kong on the back looks awesome, but imo he's also too close too the frame. If you were able to drag him down into the picture, you could put more emphasis on him.
I think that you need the adjust the black level - the back especially looks redish.
A designer knows he has achieved perfection - not when there's nothing left to add - but when there's nothing left to take away
- Antoine de Saint Exupéry