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Nice looking head texture.
Although it needs much fixing.
Your line work is very jagged and has "pixelated stairs"
I am going to give you a link on how to fix pixelation. *Click Here*
Now for the mask. It is very plain... try making some creases or do some shading.
Also putting some texture into it would be nice for example the mask on R0i's ninja texture.
Instead of using shading or creasing (while these should still be incorporated) he uses a square pattern texture.
Calamity's Shading Tutorial this tutorial will help you a lot with shading.
The hair is just not given justice at all in this texture.
Give your hair some depth. Watch some tutorials on how to sketch/position hair.
Heres A Great One
Another Hair Tutorial
Although these aren't tutorials directly made for toribash texturing, they give great basic ideas of how hair should be formed and drawn.
I hope some of these references and recommendations can help you
Best of luck \- Lost