Getting back into drawing.
I started looking at some amazing facial sketches by John K and decided I wanted to try to draw a character making the 'not impressed' face below. For the life of me, I couldn't figure out which lines made the look. I just couldn't get the mouth right without getting into a more detailed, realistic drawing.
Any thoughts or examples would really be appreciated, as would any cool links to give me a refresher on core concepts (rules, methods, proportions etc).