I think it's a very good idea, but as you say, drawing is a matter of observation and practice. In other words, it's like with a musical instrument, only regular practice allows you to improve. The best technique for me is at least 15-30 minutes of drawing a day whatever the material or the subject.
Good luck! https://image.nostr.build/fff381bfd657bc984dd728d521df0ad3e1f2d08f273aaa5724e8257338bec2f3.jpg  

 For sure it is a matter of practice, but just like with any instrument, a few hints on proper technique go a long way to get a hang of it much faster and more efficiently.