Ok, I'm working on some custom skins and I can't get my new one to show up in game and I'm not sure what I'm doing wrong. I've gotten skins to show up before so I know How to do it, including how to hook it up in the XML so the game will see it. I made some custom eyes and they show up just fine. Here's the pic I'm trying to make show up. I'm re-skinning one of the games Base Textures.

One of the first thing I notice is the grey scale part is a separate layer. I'm no stranger to editing layers and masks. I use Photoshop CS 4 and know how to use it proficiently. I'm just not sure what I'm doing wrong. Should I be doing the Skeleton Bones in grey scale as well? Is there a particular way I need to save or format the file other then a standard PNG? Here's the eyes I made that Do work.

Those eyes work fine once I hook them up in the XML (thanks James009 for showing me how exactly).
If one of the Elemental artists or skinners could tell me what I'm doing wrong here that would be totally awesome. Thanks in advanced for any help. Please also everyone keep in mind this is a W.I.P. and does not represent how bad ass the finished product will be 
Thanks ~ RavenX