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the larger you make it the more staure she'll have, but you may not want to go huge, and there's always the need to not make it too large for te space it will hang in.
given those general parameters, I'd add that, in my own work, I don't like to have a head the is small than 5 1/2 to 6 inches. A large 10" -11" head is great, but if the canvas also will include some or all of the body that can make for a huge painting. The majority of the head sizes I paint are around 7 inches high, as it's the largest I can go while still keeping the rest of the body in the composition (which most people want).
I assume you know how to use a proportion wheel and so can forcast what you canvas size you end up with based on measuring the head size. If not let me know and I'll show you how it works.
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