Mullerectomy to lower eyelid crease? (Photo)

Dear doctors, first thank you for the kind responses to my prior message. I saw an oculoplastic surgeon to ask how I can lower my eyelid crease and fix the slight ptosis. She recommended the Mullerectomy and the 10% phenylephrine drop did improve the crease (see photo). She would not do an anterior approach because of risk of overcorrection. My questions: 1) How certain can I be that my Mullerectomy result would look like the drop test result? 2) The drop test overcorrected my lid, what then?