This design is absolutely amazing! Considering the media this is going to be produced, you've managed to make an interesting design, using the space and format available. The color matches very well the original color from the movie and so the style!
I really like how you used the shading to convey volume as well as the texture of the lightning, in a way that the image still looks simple and without any unnecessary detail.
The only problems I see is with his hand behind the face, witch makes it unclear whether you intended it to be his actual arm, or some sort of icon, because the anatomy is a little bit inaccurate.
Overall it is a great pin design!
Everything is great except I agree with Cacah05 critique the hand position is awkward. Also I don't understand where he is holding. What are those blue things and why is one above his head? The pin with just Hercules head and lightning blot would look better and make more sense in my opinion.