The author utilized Maya, ZBrush, XGen, and Arnold to create the portraits.
Have a look at Facial Expression, a small collection of 3D portraits of a female showing various lifelike emotions, created by 3D Character Artist Miao Qi. According to the author, the goal of the project was to practice character art workflows and get better at creating digital human heads with various facial expressions. To create the model, the artist used Maya, ZBrush, XGen, and Arnold.
And here are some of Miao's earlier works, you can check out more by visiting the artist's ArtStation page:
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