Landscaping symbology for permaculture design - drawing trees

The permaculture designs i have seen plans for are, in my opinion, pieces of art.
We aren't being taught how to use any software to create our designs..instead we're learning how to draw the symbols by hand, with the help of a circle template. I was excited to learn a bunch of symbols, and some tips on how to draw them, for use in my own plan drawing and designing.