There are many stock photography agencies around that you can join and submit your photographs to. They will have to be very very good to be accepted though and you are unlikely to earn the sort of money that you are after unless they are stunning and unlike any others that are around.

Here's one list of photo selling sites:

http://www.sitepoint.com/15-places-to-se...

But unless you established a name as an artist or did commercial quality photos with posed models, pro lighting, etc. your not likely to make much money at all.

Unless you are some charity cause pulling at the heard strings, I have trouble picturing a 13 year old making that sort of money.

there are lot of ways to make money using your pictures. you can start online sell your pictures.

you start your site and post your pictures with a water mark and you'll say "I give you the original copy of this photo for some money" and you can sell your things easily.

see here

it's very diffi ult to make money from selling photos. the competition is enormous

You can try this one out.

I need to raise money to go on a trip, and i took some pictures of a sunset in dubai. I have been told that they are quite good and i was wondering if i could somehow make money from them? I am only 13, so i cant get a part time job yet. I was thinking i could sell them to be made into postcards or calenders? I live in London, so is there anywhere i could do somthing like this? And also, do you have any other ideas how i could make money off the pictures? I need to raise 2000 over the course of one year. Thanks!