This was Ralph McQuarrie's early version of the Emperor Palpatine.
Notice the larger size, height. The slighter, thinner body.
This is somebody changing the face to resemble the rumored Snoke look.
Snoke is now known to be like seven feet tall. Maybe a little bit more.
Of course, Darth Plagueis was Palpatine's master. Palpatine killed him.
Could he have survived? Could he have learned to cheat death? Could he have resurrected himself?
Palpatine told Anakin that Plagueis learned how to manipulate the midichlorians to create life.
Personally, I'm hoping Snoke is not Darth Plagueis.
I want him to be a new, unique character.