I noticed that on my skin there's a few pixels that isn't supposted to be there. Like black pixels on spots I circled red. You may look closely to see them. That's all errors I have noticed for now, i'll write more if i found more of them.

Ok, I'll modify the model file.

Wait, can I know which version you are using?

now i use 2.0.3, still same problem, and it's not with optifine, i tested it before
Edit: I've understood that this texture on model is rotated 90 degrees to right, not on my skin, but on model in mod.