I may have misunderstood the prompt (or a lot of others did) but I submitted the picture that I did because my understanding was that we were submitting what should have been a good photo but failed slightly for small reasons.
Particulates in the water can be artistic or they can detract from the photo. Wrong color lens can cause dull or off color photos of coral or fish. Focus shifted to something behind or beside the focal point of the picture. Glass is hazy causing dirty looking picture. Etc, etc.
I chose my photo because it is a decent picture that could have been greatly improved. Rocks and sand look dull and gritty, color isn't super bright even though the coral practically glows even in white light. Photo is in focus but the depth of focus is lacking from front to back...