I've come up with an idea to paint 4 popular movie stars in one painting for a theme, non controversial (more on the humorous side).  The common denominator is they're all into martial arts.  Who knows, they might even enjoy it.

Has anyone painted something like this and would I get in trouble or need their permission?  I'd doubt they'd reply if I asked, wouldn't even know how to contact them. 

Thank you,

Tony.