good idea
I really like this idea, you should definitely make another...but string it out, more pointless conversation. Example: maybe 3 characters - two discuss the actual art, then the third's opinion is 'I think it needs more whales' and slow down the delivery. also, think about the audience - show what the characters are looking at first to help the audience understand where the characters are...the less the audience has to the think, the more they will focus on the joke.
Other than that, good stuff man! made me giggle...