BHC wrote:
Based on these definitions, what do you call someone who makes 51-99% of his/her income from photography?
By those definitions, I would think "Semi-Pro" would be between "Pro" and "Amateur".
I would define "professional photographer" simply as someone who got paid for their photos. Even if you only get paid for one photo, you are (or at least, were) a professional.
Leave the percentages for those trying to define if they are a "Full-Time or Part-Time professional photographer"