Sorry, since the mod works via DirectX, this isn't possible.
Yeah, that nemsy Image is "too toony" for what I have in mind, if that makes sense. Too much contrast, too little lighting detail to make it look good in the game. What I mean by Portrait compatible is basically: Head and chest in a relatively straight line (lying down or standing up, no sharp angles on the neck) and most importantly the option to make it fit the portrait frame without being too large or small.
I too think that doing Nemsy is important, which is why I have invested some time in making a good looking portrait for her with some of the heaviest editing I have done yet.
The problem is: I have absolutely no way of testing it in the game, because I have absolutely no way of getting Nemsy. So"development" is currently frozen.
EDIT: I found a workaround.
Nemsy is coming.