Step 15: Use the lines on the right as a guide to draw the rest of the loafing cat's body. Draw a series of short strokes along the path of the guide to create the furry shape of the body. At the bottom, make the shape curvier and higher up than the initial guide. Darken the bottom of the guide for the cat's tail tucked under the body. Inside the body, draw a few more short strokes for the fur and to emphasize the folded hind leg.
Step 16: 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 drawing for extra detail. Cats have a variety of coat patterns, so you can shade yours however you'd like. You can also just add some shadows for a white cat. For this tabby look, draw some stripes on the forehead using a dark value and use a medium value for the rest of the head. Leave an area around the eyes blank. For a more detailed guide on how to shade, check out this tutorial: How to shade.
On the head, use strokes that radiate outward from the cat's nose. Draw some dots on the muzzle for the base of the whiskers. Leave the bottom of the head blank for white fur. Shade lightly at first, and then gradually build up the level of darkness that you like. Use strokes that go in the direction of the fur. Add stripes to the body using a darker value. Use a medium value to shade the eyes but don't overlap the tiny highlight circles.
Add more value for shadows to give the figure more dimension and volume. Vary the pressure on your pencil to get different degrees of tonal value. Separate each individual stroke a bit so that the white of the paper comes through and creates a more fur-like texture.
It's a good idea to use reference as you draw for an accurate depiction of a cat. If you have a pet cat, try to duplicate its coat on your drawing. Add a bit of value under the cat for a cast shadow. Don't forget to pause the video after each step to draw at your own pace.