To paint the greens in the picture, wet in wet technique was used. This is a very interesting and effective method of watercolor application. In this method, you need to color when the nearby wash (or plain water wash) is still wet; the color should be allowed to diffuse naturally into the wet portion of previous wash without brushing. The wet in wet technique needs correct sense of color and spontaneity.
The white spaces left out shows the light falling on the house. It was difficult to create minute shadows on the walls of the house, though the overall painting was fun to do! :)