Before surgery, my eyes were very uneven, and one eye had slight ptosis. On the side with a double eyelid, the double-eyelid line seemed thick for a man, so I asked them to lower the line and make the side without a double eyelid match my left eye so that the symmetry would be the same.
But just in case it ended up looking too intense, I did ask them to make it as natural as possible, though some people say the line is too low..