Putting the bow upside down would've hidden all the details, and it'll be alot less obvious once there's a banner attached (I hope). Painting gemstones in a normal position is bad enough, let alone when they're hidden close to a banner pole and upside down...
Whats going to be in his hand?
It's not entirely clear in the pics, but he's beckoning his enemies forward, taunting them to come and get him. It's basically the pointing hand from the archer frame, with the finger cut off, reacttached, and a wire-and-greenstuff ring added to hide the join.
Maybe this pic is a bit clearer: