Although all you are posting are test swatches so far, something i dislike about the piece relates to this:

The one on the left is going to be made up of more tiles. Whats more, you would have to place grass tiles as a second layer underneath. The one on the right uses less tiles and doesn't need grass underneath. I think the one on the left looks better, because an old wall would not be perfectly straight, even though it would need more tiles.
In your game, you could use more tiles to make a better product in my opinion. For example, right now the deck doesn't make sense, some wood goes one way, some the other. It would be better if you had all the wood go one way, and make 8 edge tiles. The house could use tiles for windows, chimneys, doors etc. I guess these are just tests so far, and also you said the fact that it is noticeably tiled is the norm for tactics games (which ive never played), but i wanted let you know anyway.