Could you support 'Randomobs' mod for your texture pack?
Randomobs is a mod that lets minecraft show different textures for the same mob.
eg: Should could have a pack of cows and one of them could be brown and another could have the original skin.
I've tried almost every single texture pack I've come across (maybe 17+ packs?) and now I've found one I think I'm going to stick with. This is spectacularly well done and beautiful. I just hope you have plans to continue to update it as the game gets older and older. Wonderful t.pack.