What makes a good photo?
First up, smart-phone pictures are perfectly ok for Photo Art... usually!
There are still times though when photos, from any camera, are unsuitable - they may be Blurred or Out of Focus
or Too Small or Missing Bits. Oh, and think of the surroundings...
A black pet on a black rug, where I can't tell where one starts and the other ends is not good. Also, the less clutter the better.