Fotolia has always been my best Micro stock site for selling photos. Today I had a sale of a photo of an accordion player. It sold through the subscription model of sales on Fotolia so not much in terms of cash but better than a poke in the eye with a sharp stick.
It is all part of the micro stock way of selling photos, the thing is that you can sell a photo many times over and if you have a large portfolio then you will get a nice income from many micro sales of your photos.
I do now someone that has a decent income from micro stock and has a portfolio not that much bigger than mine. Where he scores better is having more photos of people. People in business situations which convey a concept well well on line in this arena. I think I need more models to take pictures of.
While we are talking about models you should know that you have to supply a signed model release for any persons recognisable in your images. You can use a generic release form with most of the sites which is good if you submit to more than one. It would be a pain having to get a model to put a separate signature on a sheaf of release forms. Getting models from within the family is one place to start but some photographers make enough from the microstock sales to be able to hire models.
Yuri Arcurs being one such person. He is a Danish photographer that does this to such an extent that he employs 12 people and hires models for photo shoots when he does them. Click on one of links for the micro stock sites in the side panels and you will find that he has done an interview or two and you can have a look for his work to see what sort of images he makes and sells.