It may not look good at first, but it will look good after more practice.
2. The second method, suitable for beginners who can't draw well, first draws a closed figure with the shape you want with pline line, then modifies the cloud line, and selects O (object) to click on this polyline, so that this polyline becomes a cloud line by itself. The advantage is that it is convenient for fine adjustment, but the disadvantage is that it is a bit unnatural.
Then the next question, the points in the red box are obviously filled in. Shortcut key H, then select Fill in, and fill in dots.