There are a number of good self-help publications available to get you educated about what kind of agreement you need and what terms you might want in the agreement. "Music, Money and Success" by the Brabec Brothers is a good place to start. "This Business Of Music" by Krasilovsky and Shemel is very good, and comes with a CD with agreements. "All You Need To Know About The Music Business" by Passman is a must read. Finally, if you really want to dig deep, "Kohn On Music Licensing" is useful....
As with most legal issues, the answer to your question is "it all depends." Copyright office Circular 50, which you can find at http://www.copyright.gov/circs/circ50.pdf, will probably answer all your copyright questions. Similarly, check the publishing rights organization's (PRO) websites for information on how to get your fair share of the publishing for your songs. If you are a member of one of the PROs, you can call them with any questions and they will be happy to answer. The forms...
As always with all legal issues, the answer is it depends. Your paintings are copyrightable and you absolutely have the right to sell them. The question then becomes, what is your liability if you do sell them? Is a celebrity going to come after you for violating their right of publicity? It depends on how you sell your paintings. If you are selling in a private sale to a private buyer, then the chances of a celebrity coming after you are slim to none. However, if you ramp up and are...