What makes this house so cute? I think the fabulous proportions.
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Large fairy-tale roof of complex shape with flaps facing the main facade.
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Here's how you should choose a roof color for densely-painted houses. In the same range, but a less saturated color. Against such a gray roof, the color of the walls looks advantageous, the accent is placed in the right place.
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The plaster is "soft," rough, muted in color, makes the walls more rounded, and works together with the boards for an overall image of coziness.
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It's a good trick to make small windows significant.