Apparently, Dylan hasn't always used a blowtorch for his work. While searching on the web, I found THIS video of him making his creations with a Colwood Cub system. As you can see, his blowtorch method goes much faster, and burns darker than a typical pyrographic pen. Any loss of subtle detail, or uncertain control of the flame, is no real problem for pieces that are this large and bold.
|Still photo capture from WMTW video|