THIS IS FOR A VAMPIRE! I messed up with the topic, and I'm new to the site, so forgive me! (And moderators out there, please fix, if possible)

I just cured myself of Vampirism using Falion's ritual and the black soul gem.... I had Serana with me the whole time. As soon as the ritual was complete, and I was cured, I talked to Serana and an option is: "I want you to turn me into a vampire".

Now, I experimented, just in case, and went and to visit the face-sculptor. I changed the way I look, and then talked to Serana and the option worked out just fine.

I'm only in the beginning of the Dawnguard quests, so... here you go if you're a vampire and you want to change the way you look, and then become a Vampire Lord again!