This skin is taken directly from the song Diggy Diggy Hole by the Yogscast and I used the original Dwarf Red Beard skin that Simon (aka Honeydew) uses as a base and for color reference made by Kyn. This version is for only 1.7 and, for the one compatible with earlier versions but slightly less detailed click here.

I honestly don't know why the 3d model isn't working on this version, if you know how to fix this please comment.