elcheeso, for your hammerbat, it would be pretty awesome if you made the belly a little plumper (think Snorlax but not to that extreme) to emphasize the Belly Drum aspect. Maybe even make the hammertail more pronounced, and add some nail-looking things on the stomach. Other than that, it looks awesome!
http://i.imgur.com/bFfo0h9.png
http://i.imgur.com/ikByeh4.png