The Duke of Cambridge marked his new role as president of the governing body for snorkelling and scuba diving - by taking a dip in a pool.
The piece was painted by Dan Llywelyn Hall, whose portrait of the Queen last year was criticised as looking like a Spitting Image puppet.
Prince William performed an impromptu rendition of Living On A Prayer with Jon Bon Jovi and pop star Taylor Swift.
Despite lamenting his own "useless" video gaming skills, the Duke of Cambridge was brave enough to put them to the test in front of a room of onlookers today.
William, who was visiting BAFTA today to launch its Give Something Back appeal, also road-tested several games while attending BAFTA's Young Game Designers Workshop.
The Duke had his chance soon after his speech, trying games with titles such as Hamster: Accidental World Domination, Vacuum Panic and Smiley Dodgems, which were made by previous young design award winners.
William spent a good portion of his time trying his hand at Vacuum Panic, where the aim is to clean a bedroom before 'mum' comes in to check it.
"I'm not cleaning particularly well, I'm just going around in circles," he told designer Charlie Hutton-Pattermore as his fingers flicked over the iPad screen in front of him.
The Duke of Cambridge has hailed the "incredible" workof two surgical teams as he watched live operations at one the Royal Marsden in Chelsea.
Dressed in medical scrubs, he spent around 10 minutes viewing a breast reconstruction procedure for a female patient in her 80s.
As he was greeted by lead surgeon, Mr James, William said: "It's slightly surreal meeting you in this situation."
The Duke looked into a micro-vascular microscope placed above the body as he was talked through the surgical procedure, which usually takes six to eight hours to complete.
"That's amazing," he said as he peered through the microscope.
William is the first royal to view surgery at the Royal Marsden,which is a world-leading cancer centre specialising in all areas of diagnosis,treatment, care and research into the disease.
He has been president of the hospital trust since 2007, a position previously held by Diana from 1989 until her death in 1997.
"Kate asked what kind of music I'd been playing," Corporal Steve Johnson, an RAF recruitment officer from Newcastle, who is busking at Tube stations across London told the Press Association. "She asked me to play but then said don't because it's too busy.
"Kate was more interested in the music, while William was more concerned with the day itself and how the appeal was going. Lots of people are ecstatic to see them."
The Duke of Cambridge will watch two live operations today at the Royal Marsden in Chelsea, west London, where he will view sections of a breast reconstruction procedure and the removal of a bladder tumour.
He is set to meet members of the surgical team involved in the operations in the Wolfson Surgical Suite, including the lead surgeons, Mr Stuart James and Mr Pardeep Kumar.
The Duke will be following in the footsteps of his mother, Diana, Princess of Wales, after she watched a heart operation at Harefield Hospital in Middlesex in 1996.
He will be the first royal to view surgery at the Royal Marsden, which is a world-leading cancer centre specialising in all areas of diagnosis, treatment, care and research into the disease.
Prince William watched the first 20 minutes of the match today. There was also friendly banter between some of the supporters and the referee Howard Webb, with one spectator shouting at the official, who has a shaved head:
"Get the hair out of your eyes, ref."
At half-time, Polytechnic were leading 1-0.