Do you sketch?
If you do, do you sketch every day? It’s totally addictive. I used to take a paperback with me if I knew I was going somewhere that involved a wait. Nowadays I bring my lovely Venetian Fabriano sketchbook with me everywhere. And I use it. And I find that practice, while not making perfect, makes me looser and more direct in my drawing. I’ve speeded up and that’s helping with my observation skills.
So, if you are interested in drawing, perhaps you are just starting out, go get a sketch book, get some pens and pencils and go and LOOK at something and get it down on paper.
I read somewhere that if you don’t want passers-by to stare you go sit with your back against the wall. Then they can’t hover behind you! I’ve tried it. It works.