Adding objects doesn’t make the laptop more realistic, but it can hide things. Plus with the right composition it will draw in the audience. Look at the ad. notice the gradient behind the laptops. Gradients are the bomb. If you don’t believe me then ask Kent about them. You may want to watch cubicity before asking him 🙂 The lettering(aka copy) is done in a way to point to the laptops. There’s even a literal arrow. The laptops are stacked. This keeps the lighting inconsistency from even being noticed.