SIN OR NO SIN- Is this inappropriate?

Bishop Larry Trotter, a senior pastor of the Sweet Holy Spirit Church in Chicago posted this photo of himself and his 4year old granddaughter in a bathtub on his Instagram page.

A number of people went ham on the popular Bishop after the photo was posted online. Many feel it's inappropriate interactions with a minor because they are both topless in the photo. One person wrote

No man should ever ever ever take a bath with a female in his family or friends. That’s only for a man and his wife! This is totally inappropriate behavior!

The bishop defended himself by saying that while taking a bubble bath, his grand daughter, who was visiting with her parents for the weekend, came in the bathroom and asked him if she could get in the tub. He said yes, and it was the girl's mother who took the photograph. Is it inappropriate?