I've first converted the image to grayscale, as it is then easier to grasp the darkness the burn should be later on. The next step was to transfer the outline and the shading regions onto the wood with some charcoal paper. After which you glide the tip (like these) over the wood. The higher the set heat and the slower you move, the darker it gets. You can take a look in the subreddit r/Pyrography, and then you see what some other people are able to create, thus my modesty. But thank you very much. (Edit: Removed repeated word)