Can't find anything like this anywhere on the web for some reason...anyone (w/ dawnguard installed) have pics of the vampiric facial changes throughout the stages. I don't know if stage 2 or 3 or different from 1 but I at least need stage 1 and 4 compared. Thanks!

Your face doesn't change in Dawnguard like it does in Oblivion. It's a different strain of vampirism.

Volkihar are grotesque monsters who can only hide their Vampirism by making people their thralls/illusion spells or by wearing hoods and helmets and such, as shown by the red lines from the mouth down the chin and the glowing yellow/gold eyes, the third generation Volkihar...I assume are the ones that have bat noses, those turned by the Purebloods once again I assume look more normal than the third generation being they are closer to being Pureblooded than the later generations...

I assume because Serana and Harkon look normal aside from the razor sharp fangs and glowing eyes and the dragonborn looks similar to Harkon but since you aren't Pureblooded you have a...deformity, I guess?

The Cyrodilic vampires betrayed their lord and creator Molag Bal and helped Clavicus Vile and were gifted the ability to look normal as long as they feed.

(I can already tell people are gonna argue this but you know its true, Molag Bal hates all other Daedric Lords, Boethia most of all..its treason to help them)

I wish they made it so if you didnt wear a helmet/hood, people attacked you if you were a Volkihar.

I can understand why they didn't though, too much hassle would ruin the gameplay experience for some people.