Hey Bonahe,
I have a few crits. First, the brown house has some perspective problems. If it is supposed to be rectangular, it doesn't look like it. The right wall is tilted up too much, and it makes it look like the wall-to-wall angle is over 90 degrees. This also makes the roof look like the nearer side is very steep.
I wouldn't make this critique unless you had the brown house too, which is at an angle, but I would tilt the perspective on the red roof house just a tad. Making the perspective so straight that you end up with big perfect squares is not too good, because no matter how you shade the object, or detail it, it will always look kinda flat.
The "paper doll" walking I don't like too much. I know it is a pretty popular style, but I just don't think it looks good. I rather see an actual walk animated, then the general scissor kicking movement. However, if you want to stay with that style, I'd at least fix the legs in the horizontal walk. Right now, each leg just gets way bigger and moves foreward a little.
The trees are overall pretty good. Right lower right one you posted origionally is especially good. The texture works well, and is done very finely. However, the top, larger tree doesn't match at all. In that tree thr style completly changes, and you don't define the texture of the leaves at all. It doesn't look bad, just doesn't fit with the more detailed tree below it.
Lastly, your attention detail it good. I like the roofing and panneling on both houses. They are interesting to look at because of the bend pieces of wood, crackes, etc... The window on the brown house is neat too.
Is this pixel art though? I can see your brush strokes on many places.