Not only ain't that nothing like Solas, it's also.... why a vampire, what the heck? A vampire with a pointed tongue even.
So, basically, they give us a character we fall in love with and we express it by depicting him as something completely different from the person we were introduced to? Figures.
Eh, I wouldn't get too offended, because there are a few things to consider.
a) It's vaguely similar to some early concept art where Solas had long brown Mohawk dreadlocks and an insolent smirk.
b ) I didn't get the impression that he was supposed to look like a vampire, but vaguely like a wolf who just devoured bloody flesh. ("Dread Wolf!")
c) Again, early concept art of Solas, who looked more "Dread Wolf"-like. Patrick Weekes has placed Solas in his mid-forties (apparently by ancient elf standards), which led to many people to speculate on how he might have looked when he was younger. Then players learned Solas is the Dread Wolf, which led many to speculate how he looked in Ancient Arlathan.
A lot of people combined the meta early concept art with how Solas might have looked earlier in life, and so use the early concept art as a loose model to depict "younger" Solas and "hair" Solas. In a way, it also vaguely fits since Solas admits in-game that he was "cocky and hot-blooded" when he was younger, and the early concept art and "younger Solas" fan art movement both often have him look pretty insolent. This is just one of many examples (observe here, here, and here); and, in my opinion, not even the worst of them.
Personally, I think as long as people make it clear it's supposed to be "younger" Solas (based on a time when we technically didn't see him) or "alternate universe" or whatever" Solas based on said concept art, not "canon during the game run" Solas, there's not much harm done. It's all in good fun. 
(P.S. And, let's be honest: we all knew fans were gonna give him hair and try to "sexy" him up. If they were gonna do it anyway, I'm just glad they took it from a semi-authorative source like early concept art made by the devs, instead of whatever design they made up in their heads.)
(P.P.S. ALSO, given how unattractive baldness is considered in our culture, I actually find it really admirable how few Solas fans actually create fan art or mods to give him hair. Yeah, some do, but when you look around they're a small minority compared to just how many fan artists and screenshots portray him in all his pale, mild-mannered, egg-headed glory.
(ALISTAIR seems to get his appearance modded beyond recognition far more often, and he's more conventionally handsome than Solas!)