Oh, very solid start, i love the expression, and for me, you captured the escense of don Quijote perfectly (in a very stylized way) obviously its very WIPish still, but id love to see it finished.
-The way the shoulders are positioned leads me to believe that his right arm is higher than his left...obviously i cant really say for sure, since there's no body, but if you didnt intend on that, you should change it.
-Maybe is due to the Wipish nature of the pice, but i think the neck lines are a bit over exagerated/should be toned down a bit.
-Try to use another background colour that isnt white...as it tends to mess with your colour choises.
Keep us posted with the progress, it looks fantastic to me!