This is absolutely lovely. Although I think the tileset itself is distracting, I think it would be better to just include that in the description and have the mockup by itself.
I'm drawn to the first one. Looks good. The green one doesn't sit right with me, but still good job.
- I like them all, but the green ones are a bit dull :I -
I really like the minimalist style of the town. The temptation to add details would be a tough one for me to overcome, and I think you've managed to say a lot more with less. Even the old man looks like he has a definable shape to him, even though he only has one skin shade.
For the forest place, I'd consider taking another whack at the trees. They're so smooth and round, especially at the top, that they could be mistaken for boulders. The broad shapes works for man-made things, like the shop in the first pic, but for nature scenes it might be worth considering to give things a sharper, more randomized look.
Either way, colour me impressed.
I'm not sure why, but this is just done so well, that I'm in love.