To add to the vampire idea, they probably would be dressed badly. Same idea. Unless they have another vampire around to tell them... There's probably a vampire in a baggy plaid suit out there, with food (blood? scabs?) stuck between his teeth, and a big Alpalpha cowlick. Since they've got the seductive charm, they couldn't even use humans to tell. The women would swoon. I don't know what men do with same gender vampires, assuming they're hetero vampires... Either swoon too or not swoon, but they would be some kind of competition so he probably couldn't take what they say seriously. Only another vampire could tell him he looks like an idiot.
At least that was until technology came along. A mirror is just reflecting light. But what about a webcam? Or even a painting. Surely a painting would work fine. If a computer is creating its own recreation of the view, it's more like a painting then a reflection of light. So, would the vampire be able to see himself using a webcam and a computer screen?