Finish the details of the cab. Draw rectangular side mirrors, with two narrow rectangles attaching each mirror to the side of the cab. Draw four wedge-shape lights above the windshield, and sketch a candy-cane shape for the exhaust pipe coming out between two of the lights. Inside the cab, draw two semicircles, one just inside the other, for the top of the steering wheel. Draw the side and back windows, adding the line of the cement barrel.
Up next, we'll draw the grill and headlights.