Looking great, keep polishing

The light/dark transition on the cliff edges is still very abrupt and the grass there should cast some shadow to make the plane change absolutely clear.
I personally work better starting with a loose mockup and then trying to slim down the best ideas into a tileset. Starting from the tileset can sometimes have you ending up with a bit of a stilted, conservative end-product. Please do have a crack at some ludicrous, ambitious building designs; I'd very much like to see them.
Seisenki - I did get a bit carried away with my paint-over, but they're just rough suggestions for new directions you could take the piece; naturally very much inclined to my own tastes/whims. The stated intention of the tileset was to show off the palette, not to adhere to a particular style. Unfortunately the sprites do look quite out of place now

maybe breaking some of those outlines would ease the clash.