ecourse I recently took was using print-on-demand companies to sell your image on different products. I have quite a stash of images I used for promotional postcards that are available for me to use and resell. How Zazzle works - you select the royalty you want to get for each product, the copyright still belongs to you, so your image is safe. After you upload the images, you create products and a store. So here is my shop, filled with goodies! It's something to try, I mean why should all these beautiful images sit collecting dust on my hard drive when they could be out in the world making kids cute! You can even create shoes.
My next goal is to offer prints in my etsy shop. Do you have your illustration in a Zazzle or CafePress shop?