So, why are you're not using the same type of trees for the boundaries of this map? (Note: I'm specifically looking at the wall on the "bottom" of this screen). Also, the snowed-over grass on the road just looks odd? I dunno. Might be okay.
I guess that's supposed to be a patch of regular trees instead of pine trees? But yeah, it looks bad. It also looks, well not bad but odd, that there are no large pine trees at the edges of the map. Know what I mean? Some large pine trees would help break down the uniformity... Aside from that, avoid placing trees so close to the players path. It sucks getting stuck.
I feel the sudden patch of the snow-forest tile is odd in this particular map, I recommend replacing it with the regular snow trees. As alterego said, I recommend mixing those single snow trees with the more larger snow trees, and keeping them all off the regular pathway.
For the top with the graveyard, I recommend having the detail on the far right and left on the map and in the middle just make a clear clean pathway from the player to approach the end grave. This will probably look tidier and neater.
From this screenshot, most of the ideas on this map are good, but mapping comes down to learning what the right tiles to mix/copy/paste are and what doesn't work. I end up with some ugly maps, some okay maps and some nice-looking maps too. You improve the more you practice.