This file includes the very original conceptual sculpts of the head to find a general direction to develop further. In the second collection you can find the polished head design that came out of this process.
I also added a simple lighting setup in Eevee to showcase the polished sculpt better. Just switch to LookDev shading to see the lit render in the viewport.
Switching between frame 1 & 2 will move the empties that the original sculpts are parented on. This way you can either display them side by side or on top of each other to cycle through the individual collections to see the difference between them or the polished sculpt. For the 3rd frame of this file I moved the conceptual heads behind the polished one in a pyramid formation and gave them a material that is darker and less specular to highlight the end result in the front.