Answer:
I'd use interposition, relative size, shadow and light, and linear perspective. I'd use depth interposition by placing the buildings, fields and a river in front of the mountains. In doing so, the mountains are considered to be farther afield. By using relative size, making the objects closer, like weeds in the field, and the objects farther away, like Smaller Mountains. This will trigger a sense of depth in the painting where the pictures are. When drawing the buildings I'll use light and shadow as depth. The image will look more 3-dimensional by shading the sides of the buildings. I will also use linear perspective when drawing buildings to form sideways of buildings. Through putting a dot on the paper and attaching all the corners of the front of the buildings to that dot, I can construct three-dimensional buildings all connected to one another.