I wouldn't use to many colors, a rainbow death knight really is not very appealing, and with purple as a WC3 dk color, red, green, and blue representing the different talent lines of WoW dks, a tendency to pale (white) skin and black armor, it could be easy to get carried away. I'm fine with the coloration as is, maybe darken the skin tone a bit to make it more of a gray, possibly darken everything to make it lean more towards black than white, but if different colors are going to be incorporated I would separate them between the bulk of the skin, the axe, and the hammer. Darkening it is more of a personal preferance anyways, its fine as is for me.
Anyways, I like the axe so far
Now that I look at the beard a little more I think the mustache is a little big in comparison, maybe thin it down a bit or add a little more beard. The hanging bits also curve a little much, if you can alpha them to the same length as the center part of the beard it would look awesome (of course, I'm not sure if the texture wraps under the beard and forces you to make them that long, I have had problems playing with hair styles before). Anyways, I'm a huge fan of this skin so far, keep up the kwaliti work
