Hello,
First the background story:
My daughter started horseback riding lessons recently and I obviously had to bring the camera to take some shots. The owner of the farm saw me and asked if I could send some pictures her way since she "probably needs some new ones for the website". I kind of laughed it off at first but started to think about it recently.
For the quality I am producing now I wouldnt expect big bucks from this but if I could barter with her for lets say free lessons for my daughter I would be happy, but thats not really the issue here.
I have been shooting mostly my daughter and horses alone but I have snapped a few of other riders. If I did decide to give the owner some pictures would I run into any issues with people or their horses who are in the pictures? I am aware of things such model releases but not sure what my rights would be in this situation.
If it is a problem I would refrain from shooting other people or simply not provide any of those photos to the farm owner and it wouldn't be a big deal. I am just curious.
Edited to add:
I did read the sticky about Releases but have not found the answer to my particular situation.
I hope I am making sense here. 
I think this is the right sub-forum for this question and if not please feel free to move.

