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As for the indication of gritting teeth, it's just two brush strokes but I re-painted those two strokes over and over to get just the right look. When you look at John Singer Sargent or Anders Zorn it's not just about rendering an image—it's about putting energy into each and every stroke. I think that's what makes painting fun and hard at the same time. The whole process is deciding what to leave in and what to leave out and making sure that everything that remains is there for a reason.