How to draw Smaug's Eye, (The Hobbit). https://www.youtube.com/watch?v=dHpmlfK6CyY
Roughly sketch in basic guidelines for the eye. HB graphite works best for sketching. HB woodless graphite can also be used to expedite the sketching process.
Refine the sketch. Erase any unneeded lines. Keep the sketch as simple and light as possible.
Add a rough layer of shading to the drawing using 4B graphite. Smooth over the shading using blending stumps and paper towels.
Powdered graphite can also be used to add a smoother layer of shading to the outer edges of the drawing.
Add a layer of dark shading using 4B graphite. 4B woodless graphite can be used to cover large areas. A blending stump can be used to smooth out shading. Shading very lightly with a 4B pencil will produce natural textures that add more detail to the drawing. Highlight the reflections with an eraser.
Devolop the shading using HB graphite. Add more layers over the darkest areas to make them smoother and darker. Add more details to the iris and more texture to the eye lids.
Use a 2H pencil to refine the textures and details of the drawing. Add more layers of shading with a 4B pencil to darken the shadows/build up textures. Use HB graphite to work on any details that are too dark for a 2H pencil. Add final highlights and finishing touches to the drawing.