It is important to get the specifics of what you want in writing, either in the form of a contract or in detailed (and screenshot) messages.
The reason for this is that the law typically gives the rights to the photos to the one who took the photo. That means you may encounter photographers who will try to steal, use, exploit, etc. your content and you will have a hard time fighting against their use of images of YOUR BODY.
Under no circumstances should you be forced into this position, which is why it is VERY important that you express your expectations very clearly in written form and that those term are clearly agreed upon.
Some finer points might include the distribution of your photos, watermark rights, timeframe you expect the photos by, credit requirements, etc.
If you are unsure about something or feel suspicious that your photos may be exploited or used for personal gain, feel free to reach out to me and explain the situation. I will gladly lend my experience if it helps.