This tutorial will give you a basic idea of how to use one-point perspective to draw a room from a bird’s eye view. You may get a few monsters here and there, too…
In this video, I am using a plain old HB pencil! Try to stay within the HB-2B range for general sketching. Too hard of a graphite (the higher the H, the harder the graphite) is really light and can indent the paper easily if you press too hard. The higher the B, the softer the graphite, which will create darker marks!