Is that just a cylinder for the bow string? If so, you might want to just use a renderable spline so you get a nicer, more accurate line. Also as said above, you might want to make it a little less angular and have it flow more nicely, so it looks more like a bow (like in that COol Cat sig). Other then that...Id say give it a slight bit of wood texturing to it, or atleast a bump, to that it looks like it was crafted from wood rather then the metallic way it looks now.