Yes, shadows can really HELP, although over the last decade or so there's been a big emphasis on-line about the desirability of, "Soft, shadowless lighting," you might say. But the desirability of very soft shadows, and soft, low-contrast lighting has, I think, been over-played on the web and on YouTube. Harder light is NOT necessarily bad! Shadows help show shape, and texture, and shadows give distance and depth clues; the human eye and brain are both very attuned to reading shadows, in exceptionally short amounts of time. We use shadows as a way to gauge size, shape, distance, texture, similarity/difference, and so on. So...maybe think more about where to make the shadows fall!