prompt to get stain on "casual photo"

Hey all, new to this and pretty amazed at the quaity of the text to photos I’m getting. Working to create players on a baseball team. What is way to add grass stains or dirt from sliding to a uniform?Only a little dust shows up no matter what I prompt, and usually there’s nothing. Doesn’t seem to want to put a stain on white pants, lol. Any ideas? thx