For freelance modeling gigs where there isn't a makeup artist present, it's helpful for models to make an appointment to get their makeup done professionally. However, there are some helpful things to know to have a good experience and get the best results.
1) Know where to go. If you have a friend who works at a makeup store and is available to do your makeup, make an appointment asap! If they aren't available that day, ask them to refer you to one of their coworkers who is able to do the same type of look your friend does. It's helpful to get a personal reference instead of taking a chance and choosing someone from the store on your own.
2) Give yourself plenty of time. Pick the time frame to get your makeup done very wisely. If possible, avoid peak hours where there are a lot of customers in the makeup store. Even if you make an appointment, makeup artists are obligated to help customers so you don't want to be left in the makeup chair while your makeup artist is assisting someone else. Go early in the morning when they first open. Or ask when their slow hours are and plan accordingly.
3) Bring pictures! To make sure you get the look you want, it helps to bring a color photo of the makeup look you want. Be sure to choose a model or person with the same complexion/skin tone as you. What looks good on Asian skin may not look good on Caucasian skin or African American skin and vice-versa.
4) If you have to wear your outfit to your makeup appointment, bring along a towel or protective shawl to avoid getting makeup on your clothing. However, if you are wearing your own clothes prior to the shoot, wear a top that is either a button up or that has a large neck hole so you won't have to worry about messing up your face as you pull your top over your head to change.
5) Be responsive. Talk to your makeup artist. Ask to see what they are doing in a mirror and if you don't like something, speak up. Be polite but also be clear about what you want done. Don't just smile and pretend like you're happy when you're not.
6) Take notes. It's always helpful to learn how to apply your own makeup as a model and by asking questions about products and application techniques, you can practice at home until you're able to apply your own makeup effortlessly. If you really like your makeup that day, purchase those same products and ask the makeup artist what tools, colors, etc. they used so that you can try to replicate the look on your own.
7) Be mindful of your hair. Makeup can get on your hair sometimes, and makeup brushes can cause flyaways so prior to your appointment, pull your hair back or wear a head scarf to keep your hairstyle in tact.