Collaboration is not always easy for me. When I was young, if anyone gave me a suggestion for one my stories or a piece of artwork, I would outwardly smile and thank them, but inwardly I'd be angry. I felt that if I incorporated any of their ideas, the work would no longer be mine, and whatever suggestions were offered immediately become off-limit possibilities.
Fortunately I've come to realize that there's nothing wrong with getting advice from other people. My editors and critique group members play a huge role in shaping what I write, and my stories are immeasurably stronger because of this. As I tell the kids I work with at schools, they, as authors, have the final decision as to what advice to use, and a wise author will incorporate ideas that make the story stronger no matter if these ideas were offered by someone else.
I sometimes feel badly that books list only the author and illustrator, and on rare occasions, the editor and art director, as creators of the work. So many other people have a huge impact on the end result, including the designer, the typesetter, and the copy editor. In my novel ABSOLUTELY, POSITIVELY NOT, the proofreader saved me from many embarrassing mistakes, including the error of using humus when I meant hummus; without her careful eyes, my character would have been eating a dirt sandwich.
Yup, collaboration is a huge part of writing, and thank goodness for that.