If you've been a long time viewer of mine, you might have noticed that I like to "break the rules" when it comes to colors and even technique. I like finding my own style. If you research how to choose colors and how to shade, there's many resources on how to do it the "right" way. Even in my Zen Doodle Unleashed book I have the "right" way outlined, but I also stress that this isn't nearly as important with tangle patterns as it is with realistic drawings. I use shading in areas that I think it will look good.
Using graph paper is a great way of experimenting with different patterns that requires grid lines to create the pattern. I like to use 4x4 graph paper when I am trying new patterns and a smaller 5x5 when I want to create a detailed drawing. When I don't need a grid for the entire drawing, I will create grid lines with just a ruler and pencil in a few select areas and the size of the graph will depend on how large I want the pattern to be in the drawing.
Here's the video for the drawing. Please don't listen too much to the audio. I no longer teach classes through ANU, my classes are with Skillshare instead.