We were there in January and this is what we found
At DHS:
We found photographers by the hat, by TOT, by the front main entrance by the giant topiary, by star tours, character meet and greets, by the muppet fountain, I feel like there were a couple more but I can't remember.
We stopped at a couple different photographers along the main street in front of the hat. I'm glad we did, we had better chemistry with some then others and got better photos.
At MK - main street, the hub, the rose garden by tomorrowland, liberty square in front of the river boat, lots of character meet and greets, by the crystal palace with a different view of the castle, frontier land.
At Epcot, in front spaceship earth, the fountain with spaceship earth in the background, mexico, Canada, meet and greets with characters at character spot, meet and greets with Winnie the pooh in UK, meet and greet with Belle in France.
We didn't really look for them as much at epcot, so I don't know fi there were more around that we didn't see.
I was pleased with the amount of photographers we saw, of course I would always like to see more, but overall I was cool with it. We ended up with well over 175 pictures, so it worked for us.
Edit- I was also over all pleased with the quality of photos- I was happy with 80%. I'm glad we stopped at a few different photographers along the main street though, because we just had better chemistry with some rather then others. Also, the ones we got in the morning on mainstreet of the castle were terrible because of the sun on the castle and the shade on the street. But the ones we got later in the afternoon were great. The evening one is my favorite because the castle is lit up and you can't see the crane. LOL.