I was making an edit to your tiles but it started taking too much time (as always!
), as I'm learning myself, by studying and editing other people's sprites.
I guess I wasn't supposed to post this since I completely modified everything. Then I thought it would still be nice to share what I've learned since I used your work as base.
Anyway, here's my partial edit:
1. I've bent a little some of your grass blades (IMHO they're too organized pointing straight up) and placed some of more highlighted clusters to add depth and variation (yeah. I'm aware of the horizontal line)
2. The walls have been completely re-done. I think piled up rocks look nicer for this sort of low fence than bricks. So, this is one of the cases I'm not helping a lot by showing you this. heh.
3. Your roof was too steep! Unless it's a snowy area (doesn't seem so!) I suggest you to consider having a smaller inclination angle even if it means spending (roughly) 4 more tiles. Well. That's what I did...
4. Still on the roof, your first roof tiles (the ones covering the house, not your sprite!) had a bit of a scaling problem so I've reduced mine. You fixed this particular problem on your new perspective.
5. As for the colors I've tried to pick less saturated hues containing more yellow and reds to give it an overall afternoon look.
I might finish it in the future, but right now I'm swamped with stuff to do.
I hope it helps even if only a little bit, otherwise I'll feel guilty for posting it.
Cheers,
-Stefano