Hi Aleksandr (@apnigrich)! I'm so glad to see you and read your kind comment. I agree with you, the beauty of symmetry in nature lies in its asymmetry, but as you know, this tutorial is only intended to show the technique to use the drawing tools. So I didn't pay so much attention to that aspect, but later I will, sure.
I appreciate your aesthetic appreciation and I absolutely agree with you.
Thank you, hope to see you again!