Speed sketching

I've been trying to improve how quickly and accurately I can sketch.
This is because when the spring and summer finally arrive, I want to go outdoors in public places and sketch more often.
So if I can get a reasonable likeness in under ten minutes, then I should feel more confident when doing the same outdoors. That's my thinking, fingers crossed it works.

So these sketches are all done in under 10 minutes, hence not perfect, but improving :)

German shepherd dog ornament

My distance spectacles

desk lamp

computer mouse

small glass

For my followers who paint and draw, do you ever do so outdoors?
What are the pros and cons for you?