Head is amazing you can tell your a talented artist.The best bit about the head is the Armour.I think you could make those eyes a bit more piercing though.
I suggest renaming the title as that is too ugly to be an elf :P
But other than that the face is great, nice style there. Just maybe add some shading of sorts inside the mouth, try it if it looks worse scrap it just an idea. Also try rework the armor peices. The general shape and idea is fine just the shading could be adjusted to look more metallic. If thats what you were going for. But if if you arnt the armor needs to be changed as it takes away from the face.
Well for one, your art is great. Love the style but the ears need work. Also, one of your eyes is askew and makes it look like hes semi-mentally challenged. Also, I don't like how the teeth (big ones) are just coming out from skin like that.