One thing I always hated about vampires in TS2 was the fact they got silly, wacky poses in their UI portraits. They bugged me, since even though I could get nice default replacements for their skin and eyes(overlay, actually), those silly poses remained the same. And they got in my nerves. So I made a default replacement that makes it so the poses used for normal, regular sims are used for the vampires as well, instead of their wacky "unique" poses. I actually made this mod last year, but couldn't find time to test it then, so I'm just uploading it now.

This "mod"(I am not sure if I can call it a mod, since it is a simple replacement.) changes their portraits in the UI, relationship panels, phone catalogs thumbnails, and wherever their portraits show. However, it does not change the pie menu portrait (with that animation in which the sim opens and close their mouth). They keep their skin and fangs(the smaller fangs depicted in these screenshots are a default replacement by Rockburn, here in MTS.), the only thing that is changed is their portrait pose. Instead of the regular vampire poses, they will now get one of five poses available to regular sims. Everything else remains the same.

The replacement requires the portrait to be regenerated for the changes to apply. Just taking the sim to a mirror and making a small change might do the trick. I tested the mod with only the base game and Nightlife, and also with all EPs up to Apartment Life. It shouldn't conflict with anything, since it is just a replacement .

Additional Credits:
SimPE, the tool used to create the mod/replacement.