Quick sketch. I used one of my base meshes for the model. Roughly sculpted the hair and make clothes in Marvelous Designer. 

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Female face with some haircut variations.

Just a small practice sculpting female bust.

This model was sculpted in ZBrush by using my previously made basemesh. You can see the animation from the average to muscluar body type in GIF in the bottom of the post.

Blendshape animation between two body types. Rendered in Marmoset Toolbag.

A little study of a female head planes and rhythms. I used the pinch brush in the Sculptris Pro mode.

Blendshapes animation test based on the three body types (overweight, average, athletic).

Sculpting a muscular woman is quite challenging. The essence of the female form is soft curves, which is largely contributed by the fatty tissue of the body. Once you start adding muscle, the body becomes more lean by burning fat, thus taking out the femininity of the subject. Another key component that is being compromised is the breast (which is also mostly made up of fat). 💪👩

This time I spent  a little more time on a head study, but I am not too sure if it's really recognizable at this point. Can you guess who this person is?