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Allan,
12"-15" sounds like a pretty optimal size to me. Mine are 8" and works great for taking an 8 x 10 up to a 16 x 20. As I mentioned earlier, I use center line cross hairs for reference so I don't need, say for example, a full 10" to draw a full size head. 5" on the large end would be enough. The 8" set I have will open comfortably to 10-3/8" on the largest end. I'll try to post a picture of the set I made tonight to give you an idea. I made mine out of hardwood dowels.
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