his mask looks like what i would've done!...in the three first minute of skinning..
the mask doesnt have a texture, i dont know it is, and the shading is very poor. is the mask made of metal? make it look it so, give it sharp edges, is it made of plastic? add more highlights.
the rest of his armor is extremly blurry, it doesnt have a really clear texture or fabrics.
altho you only added an armor, wich is mad plain, you changed more than 20% of the skin, wich is a good beginning