This excellent tutorial video is from Pyrography Made Easy
Pyrography tutorial that shows pyrography shading techniques to create 3D globes and a cluster of grapes. This is a great tutorial for beginner pyrography artist. The first part of the tutorial will examine how 3 different light scenarios change the shadows on a globe. Then we will use that information to create the cluster of grapes by examining the reference photo to determine the light situation and then coloring in the grape accordingly.