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Mike,
I also use the "brush sizing" on the head itself. I divide the head into the top of the head, hairline, brow, bottom of nose, and chin, and use these stationary points as the "ruler" to measure the rest of the head. I am mainly checking my drawing of the outside silhouette shape, and the shadow shape. I don't place (paint in) the features until the head is well set, a three dimensional, sculptural shape that is the correct color, value, and size. Then I sculpt out the eye sockets, muzzle, and nose, but that's another post.
There is point at which your eye is a better judge of measurements than the brush. I find that point to be for measurements of two or three inches or less (at a reasonable distance from model).
Yes, you can use this method with photographs.
Peggy
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