I've never run into this. The scope of the project has been determined (i.e., head, head & shoulders, full figure, etc.) along with the "target size" before signing a contract and collecting the deposit. prior to the first sitting.
A possible approach would be to apply a set fee you're comfortable with for engaging a project with these open variables (it would be too kewl - having that latitude!) and let the subsequent two installments reflect the final price.
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