Istockphoto is not recommendes as shutterstock & dreamstime.com
Dreamstime sell pics for 1$(1 credit) and pays 50-65% cut depending of number of downloads of pic. Also higher resolutions are sold for more credits (2-5) meaning more $ for photographer.
If anyone is interested, You can use my referral link. But it's not obligatory ;))
http://www.dreamstime.com/res310292
Enjoy.