Hi Sidra,
Don’t know much about Zara. Annie Mansoor had a girl named Ghazia in Karachi who did most of bridals. Don’t know if she is still there coz i did all this research a year ago. I heard mix reviews about her work. She made some look beautiful while others horrible. I won’t recommend Sabs to any one.. It’s like a fish market especially if your function is on weekend. Mine was on Saturday and believe me there were around 35-40 brides.. waiting in a queue to get their hair style or base or make up done.. and in the end, Sonia applied so much glitter on my eyes that i looked like a cartoon character..
Nighat Misbah @ diplex is very good but she usually is not in Karachi during summers.. so you better check ahead.. if she is there, she is a very good choice.
I guess the safest choices are Bina Khan, Nabilas, Nighat Misbah, and Cisters @ Sheraton (I loved her makeup).