Hello this is a house that i made in about 1 hour or so and it dident get accepted so i am asking what i could do to increase the quality or things like that.

outlines shouldn't be lighter than the what they are outlining.  Such as the red used on the roof or the white used on the walls.  The undetailed fence stands out, mostly because of the black outlines that aren't present in the rest of the piece.  The grass texture could be better, or more accurately couldn't be worse.  Not to offend, but many people use this really horrible type of texturing on grass.  I'd try and find some references by looking at more experienced pixellers grass textures.  And the vertical lines on the house are acceptable for one side, but since both sides are at different angles, one side's lines wouldn't be completely vertical.  And the roof is too tall.