Any beauty work you do is unlikely to "fix" symmetry in a physical sense, because it falls into the area of what we call biokinesis and is for advanced Satanists.
You can still do intensive beauty work (simply Venus square) and work with Solar energies. This may "fix" the asymmetry on a micro level, but what it will really do is change the way you are perceived. So even if you have an asymmetrical face, you will either feel the effects of it less or not feel it at all.
However, I should point out that there is no such thing as a perfectly symmetrical face (if there is, of course it is Godly) or that you will be extremely attractive just because your face is symmetrical. Remember that it may not be your face that is "ugly" but your view of yourself. Therefore, if you are going to do any spiritual work, make sure that you make not only an external but also an internal transformation. There are people who are stunningly beautiful and handsome, and yet they may feel more insecure than the average person.