Im using hotpix.in (super low earning though) and imagearn.com (You can use your own ads) and both are alright. With hotpix I have 2-3k images hosted all adult and there is no real stats page so what it shows I earned is probably MASSIVELY under what I should have actually earned, with imagearn they suggest 3 ad providers for you to go with, I would advise you go with them for a month, and then if you have a high amount of image views sell the header and footer ad space for a set monthly rate because the ad companies they provide dont pay much. But its not hard with imagearn to get a high amount of views since they index galleries uploaded on their main page and that adds to the views you get off other places\