PAINTING ON BLACK & WHITE PHOTOGRAPHS
Handcoloring (also known as handtinting) has been around for nearly as long as photography itself, and first gained its popularity as the ONLY way to make a color photograph. Now, with color photography so firmly entrenched, many people find it very odd that anyone still handcolors photographs. From time to time I'm asked, "Why go to all that trouble when you could just shoot color film?"
Emphasis is defined as an area or object within the artwork that draws attention and becomes a focal point. Subordination is defined as minimizing or toning down other compositional elements in order to bring attention to the focal point.
By painting a black and white photo you are controlling the narrative and focuses by giving one or few things more emphasis with color
Choose a black and white "Still life" photo. Pick one with objects, something that you can paint to improve the focus and narrative. Then paint on a layer above.