Criticisms? Sure. ^^
1 - Okay, the colours are great, but you need a little more contrast. They seem to blend just a little too much.
2 - The walls of the house have an interesting perspective adjustment, but the remainder of the house doesn't match that perspective.
For example, this image of a house (from a pokemon game)
has straight walls, and it isn't necessary to have a perspective adjustment.
However, if you are going to make the adjustment, then you'll need to make the remainder of the house match that adjustment (see this image as an example
3 - You're missing some shadow and lighting effects (for example, the chimney has no shadow and the door seems to be sitting against the outside of the wall rather than being inset). The lighting on the top of the house assumes the light is coming directly from above (since both sides of the roof are shaded in the same colour) however the window shows shading as if they light is coming from the top-right.
4 - The chimney looks like the stones that make it are a pattern, though not a proper pattern as a brick chimney would have.
5 - The steps do not appear to be "stepping up" as there is no shadow to show that the first is lower than the second (walking in from outside the house).
I think that will be enough to work on for now. =D
(I don't critique much, so hopefully what I've said makes sense to you, lol.)