In toning and shading the edge of a snow bank, start with the lightest gray chalk. Put more pressure on one end of the chalk so that you automatically get the soft blended effect of the rounded snow forms. If both edges of the stroke remain sharp, it won't look like snow. You can also use a clean stomp and cleansing tissue for softening the blended surface even more. Remember the tone should blend from gray to pure white. Practice on a separate sheet.
Draw a triangular shape at the top of the front plane of the cube to make the end of the building roof. Draw the thick blanket of snow on top of this. Add a roof to the other section. Use the paper stomp dipped in light gray chalk for some shading on the left side of the roof and the underside of the overhanging eave. Use the same gray chalk for toning the left side of the distant hill. Draw the cube form of the chimney with the pencil and make a dark accent under each eave. Tone the side of the road that turns away from the light by placing the chalk on its side and exert more pressure on one end of it. Blend the right edge of the road softly with cleansing tissue. Use the stomp in gray chalk to cast a shadow on the right hand ditch and soften the line of the opposite ditch.