Scratchboard is like drawing, but in “reverse” mode. Instead of adding black lead to paper, you have to scratch off black ink from a board to expose white.
Watercolor is a form of art that push's water around on an absorbent piece of paper with a brush loaded with paint pigment for a luminous result.
Pyrography is the art of burning on dark details to create a picture. Different techniques change the tonal variations to give the piece depth.