Step 15: Use the curved line on the left as a guide to draw the first Jacob sheep's horn. First draw a vertical line made up of short strokes next to the eye for the base of the horn. Follow the path of the guide and lightly sketch the shape of the horn around it. The base of the horn should be wide, and it should gradually get thinner toward the tip. When you get the shape right, darken the lines. You can make the horns bigger or smaller if you'd like.
Step 16: Use the initial circle and curved line underneath as guides to draw the rest of the head. Darken the outer edges of the guides to create the shape of the head. Curve the lines around the eyes to give the face more structure. Add a few lines inside the head to emphasize the bridge of the muzzle.
Step 17: Use the curved line on the right as a guide to draw the second horn the same way as the first. First lightly sketch the shape of the horn around the guide line. Then when you get the shape right, darken the lines. It's okay if the horns don't look exactly alike, Jacob sheep's horns aren't always symmetrical.
Step 18: Above the horns, draw the ears using a couple of curved lines. Most of the ears are hidden behind the horns, so only draw the visible pointy tips.
Step 19: Use the curved line on the top, left side of the head as a guide to draw the third horn. Lightly sketch the shape of the horn around the guide line. When you get the shape of the horn right, darken the lines. The curved base of the horn should come in toward the sheep's head a little. Remember to make the base wide and gradually make the horn thinner toward the pointy tip.