Alamy is the eleventh stock photo website I got into, in 2013, and I have yet to make a payout, but when a photo sells the commission is significant, plus they’re very easy to add to so I keep at it.
Read their excellent Resources page, with submission guidelines and even Photoshop tutorials! Then check out some of their featured photographers.
Once you are ready to submit your photos, head over to their How to Sell Your Images page and you’re ready to go!
Susan Montgomery Photos 