Dreamstime continues to be one of the best agencies availible for both photographers and designers. Their massive colleciton is approaching 10million images, but do to a progressive pricing of images, seem to still sell new images well.
Dreamstime’s system of image pricing makes images with fewer downloads cheaper to designers. This means if you have old and successfull images, they can cost a lot more (even for blog sized images). New photographers can succeed at Dreamstime by shooting high quality photos to compete with their expensive older version. Most photographers report a good experience with the submission process at Dreamstime although it is a little more tedious than systems used at Shutterstock