Absolutely agree that a well composed and lit photograph can make plain what many words may not.
Nowadays, we are fortunate to have excellent reproduction processes, in colour, on high quality paper. .
Contrast this with the monochrome photographs from the 50s when processes and paper were much inferior.
So it is important that the photographs in an article are clear, and well lit, preferably with a plain background which does not distract from the content that is shown.
For many pictures I use a grey towel, kept specifically for that purpose, or the reverse side of a discarded heavy duty tablecloth.
A photograph which in which the eye is drawn to the background rather the intended subject is of less value, and one which is too dark verges on being useless.
Here I must plead mea culpa, not all my photographs reach the ideal standard. One or two of the illustrations in a recent varticle were not as clear as I, or the editor, would have liked, despite the efforts of the graphics department. They were given to me in1958, and like many of us have not improved with age, becoming yellowed.
At least one was poor when it was handed out, but was relevant to the text.
Howard
For some of the others, graphics folk have done a splendid job!