I was really happy (and surprised) that the first freehand sketch came out well and really didn't even want to think about trying to redraw it on a 17x24" wooden panel. My strength lies in color and not in any actual drawing skill, so I knew that if I tried to draw it again, not to mention on a large scale, I'd scuff up the board, go through most of a new eraser and end up crying.
Instead, I scanned the sketchbook page into my computer and then resized it a bit. Then I got all old school on it, using the "poster" layout to print the original 5x8" image across 9 sheets of paper. A little bit of tape and voila! My sketch is now 17x24" and ready to be transferred onto my wood panel.
I simply placed the image where I wanted it and taped down one edge to keep it from shifting. Then I sandwiched a layer of wax-free graphite transfer paper (purchased on a roll from my local art supply store) underneath and used small pieces of tape to hold them in place. Using a hard pencil (2H or so), I just traced over the outline of the image, then removed the layers of paper and graphite paper.
As you can see, the tracing leaves a light outline of the drawing which I can go over with a softer pencil for a nice clear outline (the graphite can rub off and become difficult to see if you rub over it with your hands). After that, all I have to do is warm up the woodburner and go to town!
Oh, and you can use this technique on canvas boards and it works really nicely on gessoed canvasses too!
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Pyrography in progress:
Erase graphite & pencil markings:
Give it a light sanding:
Now get painting (after a few swatch tests, of course)!