It's suggested to leave pics of your home environment so a house / animal sitter knows what to expect, but where do you do so?

I commend you on your efforts and would advise that clients not to worry about attaching photos of their home. Most profiles do not have photos of the homes where housesitting will occur. It’s perfectly acceptable to fill out your pet profiles, and message potential sitters of interest. It’s highly suggested to have a meet and greet before booking anyway. For housesitting, I’d advocate that you meet outside near the home and then the sitter goes inside the home to view where the animal stuff is kept and the areas that they are allowed to use.