Dear You,
A few weeks ago I bought an interesting book about Urban Sketchers.Since then you find in my bag not only lipstick, handkerchief and comb, but also a little sketchbook and at least one pencil. I enjoy sitting on a bench and drawing what I see: it forces me to look more precise, and is a bit like meditation.
I draw the line with sketching people: I don't. Can't. Won't. (They tell you to do it when you sit in the underground - hahaha: I think you won't sit there unmolested very long. I wouldn't want to be sketched by other people either).
Same as with photographs: I often visit photo exhibitions, and of course I look interested at photos of people - often in black-and-white. But I wouldn't do it.
I see a lot of situations that would make good snap-shots. BUT I think it is impolite.
One has to respect everybody's private sphere, I think. And I mean everybody's.
I observed a tourist who went to the big fountain on the Wittenbergplatz where a young man sat hunched in an unnatural pose. Sunken, in a way. The tourist took out his smartphone, took a photo - and went away! I was shocked. Neared tentatively - I'm not a fool, I am urban-wise - but this young man might be sick - and was quite relieved that a heavily built Turk neared too. He touched the young man kindly, spoke two or three words with him - and then we looked at each other, relieved: the youngster only had drunk a bit too much.
I think that it is important to look at 'things' not only through a photolense - that reminds me of Andersen's fairy-tale about the snow queen who had that icy splinter in her heart/eye - but with compassion.
That puts everything into the right perspective, I think.
For drawing I just practise that: perspective.