On Images of God the Father According to Catholicism?

> No man hath seen God at any time: the only begotten Son who is in the bosom of the Father, he hath declared him. (John 1:18) QUESTION: **Is there anything in Catholic doctrine which prohibits or restricts displaying an image in the "likeness" of God the Father?** *Remark:* I ask, because I seem to be coming across more and more such images. Yet, I thought that such was not permissible. Consider, for example, the Name of God for the Israelites (abbrev., *The Tetragrammaton*), then replaced by LORD (in smallcaps). Finally, somewhat recently, I thought that the Catholic Church had forbidden the pronunciation of the HOLY NAME alluded to, thus producing a change to some of the Catholic hymns to reflect this.