It took him five weeks to create the works, which are collected in an exhibition called “Farewell, Cambodia,” after the title of one of Sihanouk’s favorite songs.
Ouch Sopheaktra, an attorney for the sailors, said they had been offered $20,000 to drop the charges.
The National Election Committee has removed his name from the voter registry and the criminal convictions against him make him ineligible to run in the July 2013 election.
US officials have already expressed their disappointment in Sam Rainsy’s continued exile and exclusion from the electoral process.
Veera Somkwamkid is facing eight years in prison and Ratri Pipattanaopaiboon six, on charges of espionage and illegal entry into Cambodia.
Two European rights groups are calling on Prime Minister Hun Sen to stop using the courts to punish his critics, in what they called an “end of year crackdown” on activists.
On that day, Vietnamese-led forces and Cambodian fighters entered the capital, ousting the Khmer Rouge, which had been in power since April 15, 1975.
The journalists, 53 in all, say they were not paid for work they did for an online and print publication that closed in September 2012.
Sihanouk, who abdicated the throne in 2004, after ruling over some of Cambodia’s most tumultuous years, died of a heart attack in Beijing on Oct. 15, two weeks shy of his 90th birthday.
The anniversary is a divisive day in Cambodia, with some celebrating the ouster of the brutal regime and others marking the beginning of a 10-year Vietnamese occupation.
Sam Rainsy lives in exile, facing criminal charges he says are politically motivated and are preventing his return to the country.
Sam Rainsy faces 12 year in prison on the charges if he returns to Cambodia.