Hair Re-Trial...help!

So I had a trial a WHILE ago and I loved it, booked, signed the contract and thought I was all set. Once I received the pictures that the stylist took from all angles I realized that I was more in love with the hair as opposed to how the hair looked ON ME! The woman seems very reasonable (as to be expected considering how much cash money is involved) and it looks like I will be having a re-trial tomorrow.

Any suggestions as to how you guys communicated what you wanted? Pics? Wording? I am getting married in less than 3 weeks so I need this trial to really work out!

TIA!