Do you think artists should be allowed by law to sell their artwork on public lands without a permit?

There actually is a Federal Appeals Court ruling from the 2nd circuit Court of Appeals that has declared that the 1st Amendment protects artistic expression and requiring artists be licensed in order to sell their artwork in public spaces constitutes an unconstitutional infringement on their 1st Amendment rights.
This case was brought by street artists in NYC and when the City of NY lost the Appeals case they in turn appealed their loss to the US Supreme Court, who refused to grant NYC a writ of certiorari, thereby upholding the lower court ruling and making this a law of the land.