Drawing with a grid
safety pins and rolled up or torn pieces of paper make great up-close still life subjects. love it in charcoal.
Pen drawing of natural forms inspired by Ernst Haeckel, by Julia Wright
This is a good example of VALUE because there are many different lights and darks throughout. You can also see a few shadows and highlights, which help make that drawing look more realistic.
Red Onion chalk on black. Stunning.
pinterest structure in GCSE sketchbook - Google Search
Drawing tutorial - hair