Selling photograph is easy to do.  Register for free to agencies, take some training or quiz, then upload your photos. Wait a couple days until your photos are approved by moderator. If your photos are approved, they are ready for sale.  But if they’re rejected, don’t worry. You still can try upload again. Take more pictures which needed by graphics designer.  Clear, crisp, creative photo are good for sell, not just a snapshoot photo.