Christianity and Art
These books address many aspects of a Christian philosophy/theology of the arts.
Consider ordering your books from this wonderful and unique bookstore that specializes in Christian ART related books.
A Theology of Art in Five Minutes by Tony Reinke and John Piper
First read these 3 small "primers":
Then read these 3...
And then any of these...
On Learning in War Time by C. S. Lewis - A sermon preached in the Church of St. Mary the Virgin, Oxford in Autumn of 1939. Great justification for art as well.