I think it's pretty cut and dry.
Would this image exists without the existence of the original photograph? No, not like this.
Did the artist profit from the work that he made from the existing photographs manipulation? I don't know that much about it. But if yes, then the photographer is entitled to at least some of those profits. If the photographer actually copyrighted his work with the copyright office then he gets way more weight in the courtroom.
But I do think that a photographer shooting this caliber of star should expect that artists may create derivative works.