The character was made to look like Avaya White playing Mo.
Take a look at this model of little Mo from Fear The Walking Dead created by the founder of Tallgran Studios Isaac Olander. The artist used ZBrush, Maya, Mari, Substance 3D Painter, and Arnold.
The character was made to look like the actress Avaya White. According to Olander, the CGI child was made so the real one wouldn't be scared of the zombies, it was also necessary to age the character and change shooting locations.
Here's what the model looks like in the series:
Have a look at some other awesome works from Isaac Olander:
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