A simple diagramatic illustration of portraying how to draw a rat step by step is here. Draw an "n" shaped and "v" shaped curve opposite to each other. connect these two curves with smaller curves indicating the ears of the rat. On the bottom portion of the face, draw two small circles half-shaded with black forming the eyes, and a small triangle shape filled with black colour forming the nose. Draw three small lines projecting outwards on either side of the nose indicating the hairs near the nose. Draw the tail as shown and shade the fully diagram with grey colour. You rat drawing is complete.