My life partner tried the whole acting thing a few years ago and he tried to have short hair and go clean shaven...but nothing he auditioned for seemed to match him or his personality or skills. He's gotten out of acting for the past few years, and now he has long dreadlocks and a gnarly goatee. I think it's hot. And as one friend told him, his exterior appearance now matches his true personality. For someone who knows how to wield a sword and set himself on fire and fall off a multi-story building...he looks a little more the part. It makes me think that he should go out there and start auditioning again. I think he'd have more luck. There might be fewer parts available, but he'll be a better match and have less competition for the ones that do come up.
Our roommate, C, has actually had a lot of success lately with getting little parts and auditions without an agent or even trying too terribly hard. His niche is his weight. Putting it nicely, the guy is significantly overweight. He's round. He's not just a "big" guy. He's a really, really, really big guy. And he doesn't have much competition out there. He's told me before that he's gone to auditions that are looking for a "fat guy" and he's shown up and been the biggest one there. He's sees it as a positive. Los Angeles does not harbor many obese people and those people don't always go into acting. So that's his niche. Add on to that his fancy theatrical education and his resume looks pretty good.
So, how do you find your niche? How do you figure out what suits you? It's sad that labels are put upon us...but when you're just trying to get your foot in the door, all they look at is your headshot. I wish I could describe myself in five words or less or have an answer when someone asks what my "type" is... But for now... I have short hair and I'm hoping that makes me different enough.