Step 15: Use the initial arc and circle as guide to draw the rest of the head. At the top, simply darken the line and connect the muzzle to the front of the mane. At the bottom, follow the guide but draw the line higher so that the shape is skinnier. Darken the lower, right edge of the initial circle to create the horse's big jaw.
Step 16: Use the lines on the right as guides to draw the rest of the mane and neck. Draw a series of curved, overlapping lines along the path of the guide for the top part of the mane. Then draw a series of long, curved, vertical strokes for the tips of the mane on the neck. Add a few V-shaped lines at the bottom. Horses can have very long manes, so you can make these lines longer if you'd like. Darken the curved line at the bottom to finish the shape of the neck.
Step 17: Add a few more lines inside the head for extra detail. Add a few curved lines to the right of the eye for the muscle and skeletal structure. Add more sloping lines and short strokes on the bottom for more detail. Draw a few angled lines near the middle for the veins on the face. If you'd like, you can skip this step for a simpler horse drawing.
Step 18: For a cleaner look, erase as much as you can of the initial guide lines. Don't worry about erasing all of the guides. It's okay to leave some behind. Re-draw any final sketch lines you may have accidentally erased.
Final Step: Add some shading to your horse drawing for even more detail. Vary the pressure on your pencil to get different degrees of tonal value. By using different degrees of value , you can emphasize shadows and highlights. For a more detailed guide on how to shade, check out this tutorial: How to shade.
Use a dark value for the ears and front part of the mane but use a light value on a few sections to represent shine. Horses have a variety of patterns on their coats, so you can shade yours however you'd like. You can also skip this step for a white horse. Just add a bit of shadow along the bottom for detail.
For this look, use a medium value for the horse's entire head. Use a dark value for shadows and a light value for highlights. Use a light value to create a few streak-like shapes on the head to emphasize the veins. The key to shading is to have control on the pressure you apply to your pencil. This pressure gets you the varying degrees of value. Apply the value evenly for a smooth result and to avoid a rough, gritty texture. Add the value very lightly at first and gradually build up to the level of darkness you like. Shading your horse drawing can be very time-consuming, so be patient and take breaks.
If your highlights are too intense, add some value over them. If your shadows are too mild, darken them. Use longer, vertical strokes that are more separate from each other to shade the mane. Use a lighter value for a section along the middle of the mane for shine. Continue gradually adding value to the entire head until you're happy with the result. It's always a good idea to use reference as you draw. If you own a horse, try to duplicate its coat on your drawing! Don't forget to pause the video after each step to draw at your own pace.