The painting portrays a little Boy playing with tap water. The crucial message of the painting is that - There are things we do as humans which we derive so much joy and happiness from which can be quite beyond expectations, and that's why it's titled - "Like The Joy of Salvation"... For many Christians, the joy they derived from being saved is just something they can't explain or comprehend.
This is a digital painting that was first made as a Pen Drawing on paper and later developed as a digital piece.