Looks really great, I like the overworld sprites particularily. Only thing I would change is making the front/back view sprites bob up and down like the side view sprite, for consistency and livelyness. The portrait I think could really use some work to make it less busy and more coherent. Try focusing more on using shading to show form, and using larger clusters of color, rather than focusing so heavily on smoothing and anti-aliasing.

Anyways, I really dig this. The palette really captures the SNES feel.