A lot of my ideas come from online images. The volume of news and reportage online is enormous and images come like a digital blizzard. It's easy enough to pick a few for practice and a lot simpler than going out and sitting in a crowd. Most days I draw one or two faces or figures from news items, social media and the like. They're only for practice, though drawings, sketches, doodles, and cartoons accumulate and often give birth to paintings.
Daily drawing ought to be in every artist's routine.