I have a problem capturing scale and atmosphere, so I’ve been practicing with quick paintings. A lot of them fall flat. XD I try to spend 20 - 30mins on them.
I used to think painting anything decent within that amount of time was impossible and in my mind dubbed those folks on dA who go, “yea, just an hour on my very very epic creation…” show offs, BUT it is possible. I craved to be able to do that. I still do and have a long way to go.
One of the tricks (which is actually a lot of time and work) is building a strong mental visual library. The minute you put a mark down on the canvas, you’re directly drawing knowledge from images and experiences stored in your head.