I'm not a terrific photographer, however, I know plenty of people who are not professional photographers, but whose pictures are really excellent and could possibly earn them some cash. I've had a look at Alamy , an on-line stock photo agency and they seem very organised and business-like, with very high standards. There are quite a few of these stock photography sites on the Internet and I think it pays to carefully read their submission policies, because if they are quite discerning, you know that if they accept your pictures, there's a half decent chance that they will sell. You will also need a good digital camera - a DSLR of 6 mega pixel at least. Alamy pay you 60% of the price they receive and there is a well-supported forum for photographers which appears useful for users to ask for (and give) advice and also a blog which seems fairly up to date with postings.
The site has images from over 20,000 photographers and 500 picture agencies. Of course you need clear images with no blur or camera shake, good subjects, editing and lighting, because they will reject anything not technically perfect or any unwanted subject matter. But it doesn't cost anything - so what have you got to lose? Give it a try - you may earn some cash!
Such a gas bag
13 hours ago