is it safe to allow someone to use your photos for a book?

I'm a photographer and my friend wants to use my photos for her book, the book it's going to be all pictures, she does a lot of modeling and I want to help her so I'm allowing her to use some of the photos I took of her for her book but, is there anything I should be careful about? I have never had my photos published on a book so this is new to me, any advice? thanks :)
 
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