How to sketch sky

If you want to sketch a sky, Sometimes it's preferable for your shading to be less sketchy and more smooth. Pencil lines don't blend perfectly unless you're very careful.

Instead, use spare paper to doodle a big swatch of soft graphite or charcoal pencil, then use a large blending stick to pick up the soft dust to use for your image. Keep using the blending stick and adding more scribbles as you need more graphite. Using the same technique, start darkening some areas of the sky to define the tops of the clouds.