@Quexp You've got some good ideas going on in parts of the map, but it really suffers from all the straight lines. The river shouldn't be that linear unless it was carved out by people (in which case it could use some man-made edges to keep it in place), a bit of variation in a flowing river makes it more interesting to look at. The cliffs also suffer a bit from straight lines, if you broke up the 2-tile high cliffs with some 1-tile high ones it would feel a bit more natural.
Your use of the moss near the cliffs is interesting, but I'm not sure it quite works since I'm reading it as those areas are a bit swampy. If you wanted some variation in the ground, I think using the tall grass instead would have been a better choice.
The two buildings on the map makes me think this is the edge of a village, which could have worked even better if we could see a few edges of other roofs at the bottom of the map. Currently you don't have much besides the river and path crossing below the bottom of the map, which makes this world feel like there's nothing farther down. Adding a few roofs or even tree tops could help the map feel like it's bigger than what the viewer can actually see.
I like the design of the wooden house, and the pots of flowers makes it really feel like someone lives there. But the lack of a path from the house to the main path makes me feel like maybe whoever lives there isn't there anymore, which doesn't make sense with the laundry hanging outside. Even if the person living there doesn't use the main path often, a small path from their house to their crops and laundry would make sense.
And this is more of a personal preference, but try not to mix tree styles on one map. The FSM trees look totally different than MZ's trees which makes them stand out oddly. Are they special trees and that's why they're so different? Are they just there because they look nice? Your viewers won't know your reasoning for using certain tiles so you want to try to either make your tile choices coherent or really highlight the differences, like by giving them a fancy fence around them and a plaque that could talk about how special the trees are. If you want to use FSM trees because you think they look nice, then try to stick with them for all the trees on the map (or edit the other trees so they share a similar palette).