My sister and brother are musicans and I've listened to both run the scales in practice sessions: over and over again the same thing, working towards perfection, clarity and warming up their fingers and brains. So, they might ask: Do artist practice their scales? The answer is a resounding YES (altho for some of us, not often enough). I admit that when I tackle an area to practice and work on it with no regard or care of the outcome, I am always rewarded (just like the teacher says). But I also confess that the thrill of jumping right into the full monty (without aid of a sketch or a thumbnail or color palatte) seems to call to me and distract me from the practice I will later prove I so badly need.