After almost 2 years my total revenue crossed 300$. I totally agree with sellers saying that the more pictures, the more earnings. Collecting the first 100 $ took me a year, the next 200$ less than half a year each.
It is not much, but so far I have uploaded 244 photos, most of them editorials...Total sales 171:)
It made my day!
This is the photo which gave me 300$: