75 coloring books perfect for adults! I love the architecture books especially, but the fantasy and fashion coloring books would be great for practicing shading. I usually use colored pencils or Staedtler pens.
Kleurplaat: Walking dinosuar coloring page
You will learn so much about doing adult coloring books from this article. 18 Tips To Bring Your Colouring To The Next Level
Coloring Book of Shadows Book of Spells Printable PDF