This is a hybrid mold.
The first side has a brush up silicone mold (pink stuff) because the face was more important.

This is the first step of a MATRIX mold. This is how it is professionally done most of the time.
Covering the sculpture in clay. The clay acts like our silicone mold for the time being. Strips are keys
We're going to put silicone in last.

I like brush ups way better.