I'm a microstock photographer from Denmark with a graphic designer degree. I started as a photographer in 2010 and i use Sony's a900 and A7r cameras. Feel free to take a look around.
Here is a list of all the microstock sites i use to sell my pictures. The ranking is based on my own experiences with amount of sales, upload procedures and payout. I also added a link to my own portfolios and a link to sign up as a contributor.