The majority of oil paintings I get asked to do are from a single photo. People, buildings, landscapes, vacations, animals and pets. You might send multiple photos but it comes down to picking the right one. Changes can be made from the photo. Maybe it,s taken in the morning and you want a sunset. Cloths, colors etc. can be altered. Something of detail could still be added or something taken out. As long as the main elements of the painting are on one photo. I then draw it on the canvas in detail and send for your approval. A few more details could still be changed and then I paint. When complete I send again for your approval. A final tweak or two is fine and you get shipped a painting your happy with.
Below are some paintings showing the variety and range I can paint for you