Modeling

Has any one done it before? My first experience will be this Saturday. Head shots only with no make up for the photographer then he said I can wear whatever I please and bring my make up for photos for me. I'm super nervous I don't like myself without make up. Any tips on anything, like wardrobe, poses, head tilt?! I don't have a support team at all just my mom, not even my fiance! I need some encouragement!!!