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I'll try to not be too spoilery here.
I personally think this should've been in an optional path/objective when dealing with the Dawnguard generals. The actual side quest feels so underwhelming compared to everything prior. Probably doesn't help that it was a side quest to begin with.
I achieved this by using the Better Vampires mod (plus a certain console command) after having completed the quest normally. I basically ended up redoing the quest (after clearing it out of my log) the way I wanted to do it by going invisible, sneaking up on all of them and biting them.
The best part for me was after turning Isran and hearing him say "I knew it would come to this. I knew, and no one believed me." I felt that perfectly fit the situation/outcome of what I had done even though it\'s a stock line of his.
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One has 100% human look - you just need to drag & drop vampire eyes to the character.
Second one with a scar on the lips is your Player face- It's a result of your race being changed to a VAMPIRE RACE (depending on your initial race).
Dawnguard DLC introduces the third face type - fully bat like and this is in fact a mask. In addition to your vampire race you can also go to face parts and drag & drop a VAMPIRE FACE, also depending on your race.
When you turn into a vampire you get the 2nd face cause only your race is changed. A sufficient scripting change in the PlayerVampireQuest script can make you get the 3rd face type.