it scares the shit out of me, his face looks like a kuma (japanese bear), and he is so hairy - its just scary. The eyes look very wrong and almost orthogonal aligned whereas they should be more angled in a natural way like it does in the concept drawing. The hands are also very scary, like the ones of a hair old strong man…
His eyes don't seem like they are eyeballs at the moment. They look like they are just painted on his face which is giving them a weird mask/creepy look. I think your best bet would be to cut holes where the eyes are and put spheres in so they aren't just textured to the skull. Also this would give him a much needed eye…
It is the lighting, you need more fill light. The underside of his mouth, the bottom of his shoe and his general right side is too dark. You could use a rim light too. Are you familiar with the 3-point light setup? I like the ring.
You should check the object space box only if you are using object space normal maps. You are using tangent space normal maps, so leave it unchecked. The strange lighting you're getting is likely a smoothing group issue. Check your obj export.
the problem i am having is the hair texture. I think if you broke up the spikes a little maybe using an alpha or something to look more like liberty spikes Or maybe just smooth down the hair texture in the normal so it is a little less BAM in your face!!!