Well i think this is the best head i've Done so far but still give me some feedback about it guys and how much would you give it from 1 to 10.

You need to add highlights and a lot more shadowing to create more depth in your head.
Also you should do copy and paste the right side to fix the back off the head, and I think it should look more metallic looking because off the fact it's a "robotic" ninja head

nice head... but the back not get blur, try to blur the back
hm... 7,5/10 lol

The back doesn't line up which is kind of weird. It also looks really boring with little to no shading. What is that star for?

I fixed the back and it looks great in-game but i'm too lazy to re-upload and i also blurred the back thanks for the tip watermagic it looks cool. I was messing around with shapes Hobo and i think that star is maybe a symbol to a ninja clan or something like that but it just looks cool meh xD