How successful you become is mostly up to you. Success also depends on how you're perceived by others.
Numerous studies have shown looks can impact career advancement. Some say physical appearance matters even more to employers than a cover letter.
Researchers have found that facial structure, hair color, and weight all can affect our paychecks.
We can't help our genes, but some of them may be helping us more than others.
http://www.businessinsider.com/if-you-have-any-of-these-20-physical-features-your-pay-check-will-probably-be-higher-2011-2?op=1
I've seen some of these played out in a work environment.