Looks cool! Is it me, or are these normal maps in a different scale that your sprite? The shadows seems smoother than your pixel art.
Viewing post in Hiatus Terminus (I'm making stuff again) comments
I guess there are a number of things that cause that. The most intended part of the effect is that I use anti-aliasing filter and sometimes an overlay of 0.5px blurred mid-tone masks on the sprite sheets before having GIMP generate the map. Since they're trying to generate for model textures they treat everything like a bump, but all it takes to get a standing sprite effect like this is to apply a convex curve on the green channel and presto the light goes behind the character / prop