Logically speaking, when somebody is going to the gym, in order to achieve the maximum aesthetic result he tries to workout muscles of both sides(left and right) equally, in order to achieve the maximum symmetry possible!!That is very difficult because people are either left handed or right handed, and normally one side is more trained than the other.this leads to small body asymmetries , because the more trained side is slightly more massive than the other side!!
The same thing happens with the face.What makes a face is bones, skin and muscles.And we know that the more the one side is identical to the other side, the more attractive is the face considered.That is symmetry.What does that mean?How can an individual intervene and enhanse its beauty?Of course science till now cannot change bones, and create perfectly symmetrical skulls.And that is very crucial, because the shape of the bone determines symmetry and beauty in a big proportion.Noone can just make an ugly woman beautiful just by transplanting Claudia Schiffers skin, because the underlying bone will help the ugliness to stay there.
One other parameter of a faces attractiveness are the underlying muscles.No one has absolutely symmetrical muscles, because muscles from the dominant side are more used, and that leads to small asymmetries in left side and right side muscle fibers.I really wonder if someone can intervene in that with some techniques,and which are these, and create equal sided muscles.I also wonder if the creation of identical sized muscles on both sizes can enhance, even slightly, the beauty of a face.I think that studies must be made in that direction
 
What is your opinion about that?

I agree that the dominant side of the body may have slightly more muscle mass, but I do not feel that there is a visible difference.