A great little post by Arturo Vasquez on depictions of the God the Father in religious art, especially at Mount Athos in Greece.
Here's an excerpt:
As for the depiction of God the Father, such images appear even in the monasteries of Mount Athos, the sanctum sanctorum of Orthodoxy itself. There is one where God the Father is sitting in paradise with God the Son (a small child) on His lap, done in a very Byzantine style. And the Holy Spirit is always portrayed as a dove in the Theophany icon, and He is not God the Son. I think while the principle that the Word of God is the true revelation of God is something to always be kept in mind, it is not a reason to disparage other forms of art that are done devoutly. Nowhere have such rules been applied with universal rigor, and so a depiction of God the Father is not at all blasphemous. Maybe less correct, but not blasphemous.