How to book session: Twelfth+Grace has made the booking process as easy as possible. First, you initiate the booking process by selecting an available date on Shannon’s CALENDAR and then complete the ‘Enter Billing Information form’ and book event (no credit card information is provided at this step!). Billing Information during checkout does not include credit card information. Upon receipt of your booking submission, I will forward a Senior Portrait Agreement and Electronic Invoice via email. The secure electronic invoice will allow you to pay the session retainer of $200. The Senior Portrait Agreement link will allow you to review studio policies as well as sign and submit electronically. Your senior portrait contract and $200 retainer are due with 48 hours to secure your booking date and time.