Why grace at meals is gnostic & other reflections on Christian Art.
Richard Beck has a nice column about Christian art and aesthetics I would recommend to you. It's called "Thoughts on Art," of all things. A taste:
This obviousness makes the artwork excellent for teaching, but it dooms the piece as an attempt at art. This is the second way text gets in the way of art: Good art isn't obvious. Good art is subtle and multilayered. It might take a lifetime to plumb good art, with new meanings bubbling up over the years. Good art can't be reduced to a PowerPoint bullet point. Unfortunately, much of the art and decor you find in Christian bookstores is reducible in just this way, making the "point" of the artwork explicit and digestible. The goal is to convey cognitive content, not to prompt the searching of your soul.