Hey there,
Have you ever thought "I want to be free, and as a freelance illustrator / photographer, I want to earn satisfactory money from my illustrations / photographs"?
Well, here is a great news for you.
A year ago, a friend of mine told me about "Stock image" business. He gave me some links of those stock image web sites. You know "Image Bank" printed catalogues? Stock image sites are online versions of those catalogues.
I registered to those stock image sites as a referral of my friend. I start sending my illustrations to those sites. Those sites pay money to artist for each download. I made considerable amount of money in one year. I am not working in any company right now, only drawing for stock image business. It is great and fun!
How much money you can make from stock image business? That depends on the quality of your illustrations / photographs.
You can register to best stock image sites here:

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Shutterstock is great, make it first priority.
I will answer all of your questions and problems about that topic.
oguzaral@gmail.com
Take care.