HIgh res - doesnt mean better. From where im sitting - this is nothing more than horrible camo recolor of original arctic. Hi res texture causes anti alasing problemsmand texture could use some wrinkle shadows here and there...
Make a fitting normal map. If you got PS, there are the the nvidia tools for creating one
Detail: Wow, first time i see newbie, that maked really great retexture (not like those ugly M4's newbies retextures and recolors).
Realism: Like someone in this site said: F*ck realism, go for looks!
Texture: For your first skin, its very good texture. I give you 9.8/10, because you worked on this skin, and the results speak for them self. Next time.. I don't know, think for your self, for me this skin is nearly perfect, but still it feels that it needs something.