Visiting the murals, he said: "I'm truly amazed at the effect these have had on me. They've just completely stunned me.
"I thought I'd be all light-hearted on seeing them and jokey - but they're so big - the effect on me is so profound."
"I'm just flabbergasted, overjoyed, it's been a brilliant experience - being painted and otherwise by these genius people taking the time to do it. It just takes my breath away, I love it."
The murals, which are more than 50ft (15m) high, have been created by BBC Scotland together with Glasgow City Council and arts project manager Art Pistol Projects.
They are based on original portraits of Billy from top Scottish artists - John Byrne, Jack Vettriano and Rachel Maclean - commissioned by BBC Scotland.
The story of the artworks will be told in the programme Billy Connolly: Portrait of a Lifetime, to be screened on BBC One Scotland on Wednesday.