Shadows are now blue instead of black (still not quite right, though) and highlights are on stuff. Everything's a bit too bright right now, but that's mostly because the highlights are pure white for now. Next step: Coloring the highlights, correcting some lighting-errors and trying to give the damn thing more contrast.
I also need to to something with the clouds. Dunno what yet.
Also, Pinkie and Applejack have the WORST colors for lighting. Shadows somehow just look wrong on them.