Ears look like they match the rest of the body fine to me in that pic. The facegen for Oblivion is actually really terrible when it comes to texture matching the body, I think there was some kind of mod that tries to fix it by limiting sliders but it also changes NPCs faces(plus I dont remember what its called). Its supposed to
help with the offcoloring you get at the neck.
But the coloration is mostly something you just have to live with. Mostly because Roberts is like the only male body replacer and seams are really notable
You could try using IFT or Natural Faces but Ive never noticed either one making much of a difference personally.
Edit: Wait I actually had it bookmarked but I still havnt tried it myself http://tesnexus.com/downloads/file.php?id=35487