Had a Bad Day
I did.
Maybe the artist who painted the above image had seen Romuald in the midst of a really bad day... but this saint might've had a more serious look to him any day of the week!
Living in the 10th century, he was a regular nobleman's son before he reached his twenties, engaging in many frivolous and wild activities, until he had a conversion of heart. After this conversion, he turned his life around and lived with very severe austerity and a strict prayer life. He founded many monasteries and hermitages in and around Italy. After he died, his body was found to be incorruptible.
Read more about this saint on Catholic Encyclopedia.