Level of Difficulty for Books
Colourng Technique & Colouring Toolbox
Creative Colouring Technique
New Guide to Coloring
Encyclopedia of Coloured Pencil Techniques here.
Tangled Fantasies by Jane Monk
Tangled Travels by Jane Monk
A Roundup of Colouring Technique Books - here.
Faber-Castell Perfection Pencil Eraser - here.
Extra Dark Shades PanPastels - here.
Schpirerr Farben Pencils - here