What makes this house so cute? I think the fabulous proportions.
Large fairy-tale roof of complex shape with flaps facing the main facade.
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.
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.
It's a good trick to make small windows significant.