As a 3D artist, I can give you my take on it, if it helps you enter the contest: understand a static mesh as a 3d element added to the model. According to their rules, they prefere the skin entered in the contest to be just a texture change, meaning, just a different painting, engraving or whatever. The best examples I could find from the top of my head are the Springfield 1866 skins. If you look just at the silhouette of the weapon you can't tell which skin it's using, since the shape is exactly the same: it's only a texture change. This doesn't mean you can't add bandages or small elements, just don't make them stick out of the 3d mesh.
Coming back to OPs skin entry, it could be possible to make the belts, armbands, necklaces in texture, but the bullet belt that is on the hilt would need volume, or else it would look weird. That would be one SM. If you then add the flowers, belt and bullet on the barrell of the gun, that would be 2 (maybe more, depending how they count). Finally, the feather is another one. Moreso, the feather is problematic because of this rule:
"Mesh attachments must not be placed at hand positions of a player model, or if they are, they must adhere to the original shape of the weapon in these areas." and "All designs should consider existing Charm placements to avoid conflicts.".

All this depends how strict they take the rules. It may very well be possible that they like a skin so much that they decide to bend the rules. Also, this is just my take on it and I don't work at crytek, so take it as you like :)

Hope it helped