This controversy has all the elements for a gripping thriller: Science. Art. Intellectual property arguments. Money (or rather, lack of it). And, above all, dinosaurs.
In brief, Gregory S. Paul is one of the major figures in the paleoart community, enough so that his work is widely imitated. Paul, not surprisingly, is not happy about this state of affairs and has threatened legal action against imitators. He is defending his livelihood against those who would create knockoffs of his work and then underbid him to get illustration commissions. However, there are those who believe that Paul is claiming copyright protection for intellectual property that he cannot copyright (such as the pose of a dinosaur reconstruction).
Monoyios’s post (a Scientific American Guest Blog) starts from there and fills in the larger context of “art for science’s sake.” Her clear summary discusses matters like declining funding, copyright in the scientific world, staff artists vs. freelancers, and other trends that are relevant to this controversy. She also has a list of links to other blogs with commentary on the situation.