Not a dumb question at all! Figures need shadows and highlights not only to bring out the details, but to look realistic. We’re used to seeing people full sized, picking up natural light and shadows and various flesh tones, ect. Because we see that in each other in 1:1 scale, smaller figures, even 1/6 scale figures are too small to pick up the same amount of light and shadow we’re used to seeing, so they look flat and dull. Keep in mind that a smaller figures need more contrast than a larger one, but depending on what kind of effect you’re going for, it’s up to you, and when in doubt, less can be better. Hope that helps. I always recommend Shep Paine’s how to books because no one explained painting figures like he did and those books are a treasure trove of great information