My thought is that you recommend certain sizes for the various subjects. A 3/4 would have to be 22" x 28", a full figure 30" x 50", etc. An infant face in a 9" x 12" works well this way, too. I never like to work too small. Landscape backgrounds have to be a bit larger, too. If you charge per tooth or finger, it is a little bizzare. I never cared whether the subject smiled or not. I kind of like the idea. Some portraits are harder than others anyway. It balances out.
I have some investigating to do on this issue.
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