Having issues with the head and the boxy not having the exact same texture so you can see the difference. I wanted to post some images from imageshack (big ones so you can see it clearly) but it won't let me post images. How can I show you my problem then? Can I somehow allow you to view my images on imageshack or how can I upload them to this site?

One thing to check: do the faces have a weird grey tinge to them? It could be that the heads in your mod aren't "baked" - which is where you have to press CTRL+F4 to export the Facegen settings in the Creation Kit when editing or making new faces. Since this is a new step for Skyrim (compared to Oblivion) then a lot of people don't realise you have to do that when making mods.

Other than that, it could simply be an incompatibility between your face textures and your body textures. Have you downloaded any new "beauty" mods? If so, have a look at the download page; they'll usually recommend a body texture download to go with it.