I have notices over the past several months with my photos and studding other people’s photos that certain photos do better on different sites.

For example my portfolio consist mostly of people in their everyday life (family, siblings pregnancy and so on). I notice different post that would read how their earnings doubled on certain sites. When I would locate them on these sites I notice that their portfolios consisted mainly of food items, illustrations, or something else. What I would like to try and discover with this survey is a pattern to what sells well on what sites. It would be great if you could participate.

Here we go:

My Portfolio consists mainly of people.

IS (285 files) #1
SS (403 files)#2 (double this month)
DT (374 files)#3
SX (317 files) #4 (doubled this month)
BS (557 files) #5
FT (183 files) #6 (I do so bad here I stopped uploading photos)

My main subjects are food and travel. Their rankings are in the same order as yours, except that IS and SS tend to flip-flop, and 123RF is my #6 site. Also, I will be removing my portfolio at Fotolia in the next few days due to serious on-going concerns with the company's business practices and their lack of interest in resolving them (I'll post more later).