I am new to this forum. Please let me know if this is not the right place for this question.

I am not a photographer. I am looking to purchase extended licenses for about 80 photos of specific themes to use in a board game. Currently I am searching on several stock sites. With some themes, I am not finding the photos that fit the need. What is the best way to put out custom requests for photos? (For example, I need a pair of photos, one of a child kicking a soccer and one of a dog chasing the same soccer, with the same background, to indicate the two events are happening in the same place.) I would prefer to purchase the licenses through the stock sites, not directly from photographers, to simplify the licensing process.

Thanks for your help.