Simply drawing a lot of boxes and spheres is great and all, but it's even better to try and understand the principles that rule the world of perspective.
One such principle states that the distortion caused by perspective gets stronger the closer you are to the object. This principle has been famously applied in many movies in the form of the dolly zoom effect, Where the camera simultaneously zooms out and comes closer to the target, thus creating the intense effect of the background moving away.
Getting the hang of principles such as this one will open up a new world of stylish – and professional – effects for you to apply in your drawings.