You are talking about pen drawing and marker. Building block design is actually a whole. Pen drawing is a manuscript. Markers are used for coloring, and you can also learn to paint gouache. But what you are after now is a fast word. Markers are characterized by quick coloring and easy drying. Gouache needs color matching, which is troublesome and slow to express design ideas. Marks express design ideas concisely and clearly. Quick question design refers to the content expressed within 3 hours of general postgraduate entrance examination. Express the overall design purpose and ideas quickly, and you can also use pen, paper and marker to color, but it is simpler. Lushan Mountain is not recommended. I have answered the instruction post of Lushan Mountain, so you can have a look at my opinion. At present, I think the best thing to do is Changsha's excellent hand painting. It's up to you whether to go or not. I'm not asking, I just want you to compare it with many hand-painted institutions.