“I’m still pretty skeptical about doing this...”
The first order of business check with the union many photographers are members of a union ask their opinion about the photographer.
And yes, take more than a chaperon - take a serious looking chaperon with you someone that knows you. While you are out on an outing do no nudes. (That includes semi nudes, too) such requests are asked before you are assigned the assignment. If, asked on assignment to do some nudes... do remind the photographer about your contact with the agency and his client... then go about your job looking pretty. Use self controls for you have back up
Listen to your contact and yourself.
Ask other models most will and can not wait to tell you something about anyone. Listen for what makes sense. Make this a habit... Always go with a chaperon - having a chaperon will not hurt. Most professional want to get paid and will do nothing that will shorten that future pay check.
But, always be aware there are predators out there waiting for a innocent looking woman or girl that want it ( being a star or that super model)so bad that they will do just about anything to get. Just put visual limits on yourself. Disney does not do nudes... period!
Photography is an expensive job and hobby. So, do not waste the professionals time for, word will travel just how professional or unprofessional you are. Look chic and be earthy.
*note a concern about the photo you used: If, you are using sepia shots just use the ones that focus on the face with your neck elongated and angled... sepia means chic, elegant,etc...