Typically, this decision is made jointly by the collaborators. This may include making editorial changes to the work in the case of a book, or determining which company you permit to license your image. This would permit him to license the work to a third party without the necessity of first requiring your permission. Arbitration and attorneys' fees clause. Although collaborators start out as friends, unfortunately it does not always end up that way.
People change and things can get rather ugly.
Rather than slug it out in court, and wait several years before some judge decides whether you have any rights to a work you created, it would be wise to include a mediation and arbitration provision in your agreement. California Lawyers for the Arts has both a mediation and arbitration program. Mediation is an opportunity to work with a neutral third party to discuss your problems and hopefully resolve them. If this cannot be done, arbitration is a quick and cost effective way to resolve your differences. An arbitrator renders a decision that will be binding on the parties after hearing and receiving evidence from them.