Reflections, illusions and other such images can't be used to convey a gaze attack. Even if they could. Vampires are immune to dominate anyway.
Also, vampires don't produce reflections in mirrors by RAW.

Nope, you're spot-on. Only someone the vampires suck dry gets vamped.
Not technically correct - if slain by a vampire's energy drain from its slam attack or any natural weapons it possesses, a humanoid or monstrous humanoid will arise as a vampire spawn and so would be "vamped;" the blood drain is only necessary to create a full vampire.