Julie,
I like the smallest one the best. It seems to make the most sense and feels right within the dimensions. This size is not unusual for a head and shoulders portrait.
However i would still do more to make the shirt read as three-dimensional with a definite shape, not a lot of detail, but some crisp edges in the lights, maybe at the neck, with a shadow behind on the skin where appropriate. The crispness can fade towrd the edges, but I believe it is important to show the form especially around the neck and shoulders, and indicate the shape of the arms and placement of the underarms.
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