Pillow Talk. These days I'm not letting myself just sit and watch a movie without trying to sketch it. (And why, you might ask, am I sitting waching something like "Pillow Talk"? Good question....)
I've found that drawing from old movies with proper movie stars really makes a difference. In the olden days, everyone's features tended to be very distinct. We don't have a DVR with pause and slow-mo, etc., so I just have to draw as the movie unspools. Even tho' a lot of the sketches wind up funky (and unrecognizable) this way, sometimes an unpredictable, almost subliminal likeness appears. The drawing shows you something in the actor's features/personality you might not have discovered otherwise.
Other times, you just get crappy drawings and long for the ability to sit down with a photo and get the person RIGHT.
Tony Randall, Rock Hudson, Doris Day, and yes, Nick Adams as the Harvard Boy.