In one recent project, we created two similar visuals for a concept (scroll through the two examples back and forth). One is cartoon-like and straightforward, the other more expressive and stylized. Both are clearly not "real," yet one feels more evocative. Why is that? Take a look at the versions; what do you think?
Do you get the impression that the first image feels like a kid's breakfast TV show while the second is like a cheeky magazine editorial? Neither image changes the subject, just the style. Yet I sense that the emotional inference about the message shifts dramatically.
What can we learn from this? Content is not only about what we say but also about what others might sense before they know what they're seeing.
So, here is an important guideline, even if you're not a designer: You may select something to show an audience, and as you make your selection, ask the question, "How do I want it to feel?" Even if you're using stock visuals, filter them not by category but by emotional tone: playful, somber, ironic, precise?