Looks flat, also objectively blizzard icons and icons generally trying to avoid using white background, because it fills eye too much, and reminds Windows XP style of buttons. So, darken this background to black, or, betterly, draw an juicy special effect; apart from that 3D objects need shading. Google few shadowing tutorials and give an eye to youtube time lapse drawing videos to learn something in shaping and drawing, then come back with updated version of this icon (or any another icon).