Step 10: Inside the rhino's muzzle, near the top, right, draw a thin, small shape for the nostril using curved lines. The shape should be similar to a thin oval with pointy ends.
Step 11: Darken the curved edge of the initial arc to create the shape of the muzzle. Curve the line to the left so that it ends at the circle's edge. This will create the rhino's mouth. Sketch lightly at first. When you get the shape right, darken the lines. The line for the mouth should be a bit wavy. Don't place it too far below the nostril. Below the mouth, draw couple of short, curved lines for the lower lip and chin. Follow the basic curvature of the initial arc as you draw the rhino's lower lip and chin.
Step 12: Above the muzzle, draw the horn as a small, triangular shape. Sketch lightly at first. Place the rhino's horn directly above the nostril. Unlike the white rhinoceros, Indian rhinos only have one horn. You can make the horn longer and pointier if you'd like.
Step 13: Use the small arcs on the head as guides to draw the ears. Follow the path of the first arc but make the shape thinner and pointier at the top. The bottom of the rhino's ear should be inside the head more. Add some lines inside the shape for the ear's structure. Draw the other ear the same way, except the line inside should be closer to the middle because the ear is turned.
Step 14: Use the remaining lines and shapes as guides to draw the rest of the head. Simply darken the outer edges of the initial guides to create the shape of the rhino's head. As you darken the edges of the guides, make the lines wavier for a blockier shape to the head. Draw a few curved lines inside the head for the wrinkles and thick skin. Add longer lines under the eye and shorter lines under the horn and mouth.