With pro photoshoots, it's the photographer's job to make sure you look good - and the makeup artist's! I like to get my pics done somewhere where hair & makeup is done for me so I can relax about those things. Then, all you need to do is focus on fun ideas for outfits, props and poses - what is the studio like, where you're going? Is it a big empty room or an old home with lots of furniture (chairs, beds, mirrors etc)? If the latter, there are tons of poses and different things to try. Practice some poses before you go to find out what suits your figure best, and make sure the photographer is friendly and happy to give you guidance as well as listening to what you want.
Also, decide beforehand if you'd like any topless, nude or implied nude pictures. Along these lines, I'd say the most important thing to be thinking about here is your escort persona (photoshoots are a great way to have fun portraying this) and the image/message you want to put across. You could have quite demure, simple photos, or you could go for elaborate, fancy ones, or an arty tone with black and white or anything really!
They say pictures tell a thousand words so if you figure out a way to have your pictures reflect your work persona, services and USP(s), you'll not have to worry so much about clients failing to do anything on your website except see the photos and call your number.
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