United Kingdom, July 7 -- Sylvester Stallone has become a "man who concentrates on his art".

The 80-year-old actor has enjoyed a hugely successful career in Hollywood, starring in the Rocky and Rambo film franchises - but after stepping back from his movie career, Stallone is now embracing his love of art.

A source told People: "At 80, Stallone is a man who concentrates on his art.

"He has an incredible studio built at his house, and drawing and painting is his life. If he has a character to play, he sketches it out first."

Despite his tough-guy image, Stallone has always been a huge art enthusiast, and painting has been described as the actor's "first love".

The insider shared: "He had an amazing retrospective of his work in January...