What I meant was... when you shade outline, the lighter shade should be the less pixels.

---------- Post added 07-03-2013 at 07:53 PM ----------

As for the pink, it seems to be the matter of the palette.

But to the armpit creases. Wherever you have that creases in small area like sleeve, try ignore your original smooth shading, and focus on the crease. Currently, the crease look just... splat on. Not carefully curved in. AND the further the crease from the armpit, the lighter it become, then slowly blend with the rest of the sleeve.