I am not sure of any texture or visual improvement mods that are specifically NSFW, they're doing the same thing whether a character is naked or not.    I am assuming you have physics like HDT-SMP, CBPC, and/or CBBE 3BA (I use all three).   @belegost mentioned the Bijin and Pandorable series of mods, I use them and think they're great.  I haven't tried the other two he mentioned.   I have a mediocre computer that can't handle the high end stuff, so what I'm using is