By Evan Nachimson The SI Swimsuit model gives a behind-the-scenes look at her makeup routine. As a professional model since the age of 15, SI Swimsuit veteran Marquita Pring has picked up quite a few tricks from the makeup artists with whom she’s worked. “As a model, you are exposed to so many cool tips and tricks from people that really know what they’re doing,” she says. Pring was all too happy to give a behind-the-scenes look into her simple and easy makeup routine. Set in a bathroom in the O2 Beach Club & Resort in Barbados, Pring took us step-by-step as she got ready for the day. Step 1: …