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Find out what agencies there are that contract plus size models. Not all agencies do, but it is becoming more commonplace for agencies to have plus size model divisions. For example, modeling agencies Ford and Wilhelmina have plus size modeling divisions. Additionally, look into the plus size models they have already contracted and make a log of their statistics, i.e., height and measurements, in order to see if the agency is right for you. It doesn’t hurt to study and learn about the top models, photographers, and stylists in the industry. For example, learn about the world’s first plus size model, Melissa Aronson. By having this knowledge, you will have a clearer picture of what the industry looks like. This also shows the agencies that you are serious about modeling and that it is something you have taken the time to look into. Always make sure that the agencies you are looking into are reputable agencies. Visit the websites of top agencies to get a feel for what a reputable agency is like. If someone wants a payment upfront in order to see you, this is a red flag, and most likely a scam agency.  Never pay a manager or agent to be a part of a "Lookbook" or to find work for you. Agencies that are legitimate work on commission and receive their commission only after they have booked a job for you. Beware of talent promoters and internet agencies online who say they will promote you or list you on their website for free or for money. . As an aspiring plus size model, photos are your resume. Be sure to get some quality testing photos. Testing is when a model has a photographer take photos for their portfolio. It is also recommended that you have a professional make-up artist and hair stylist for the photo shoot. Depending on the photographer, it will cost around $200 to $500 dollars to develop a quality modeling portfolio. You need to have two main photos: a headshot and a body shot.  A headshot is photo of your shoulders and your head. You can have bare shoulders in the shot, or you can wear a simple tank top, lightweight cardigan, or button down shirt.  A body shot is a full-length shot that shows your figure. You should wear clothes that accentuate your figure, as well as your hair and skin tone. Your policy on deciding what to wear in these shots is simplicity. Your outfit should be simple, i.e., one solid color and no logos. You hair and make-up should also be very simple and natural. Before going to an open call or taking photos for your portfolio, you need to practice. In order to practice, you need to know your body shape and how to move. You need to find out what your good sides are, your good angles, and the shapes that accentuate your body.  Your mirror and lighting are your best friend here. Stand in front of the mirror to learn how your body shapes so you can perfect your poses. Play with different forms of lighting, i.e., bright, dim, incandescent, and color, in order to see which lighting brings out your skin tone. Also, play with angles, i.e., above, below, front, to the side, in order to see which angle accentuates your facial features.  Remember to always hold your limbs slightly away from your body in order to create a separation. This will create the illusion that your limbs are slim and toned.  Remember to elongate your neck, angle your jaw toward the camera, and learn how far you can turn your head before your nose "breaks" your cheeks. Practice these poses in front of the mirror regularly until they feel natural.

Summary:
Do your research. Avoid scams. Develop a quality modeling portfolio Practice.