“The heart of the objection to pictures and images is that they inevitability conceal most, if not all, of the truth about the personal nature and character of the divine Being whom they represent.
To illustrate: Aaron made a golden calf (that is, a bull-image). It was meant as a visible symbol of Jehovah, the mighty God who had brought Israel out of Egypt. No doubt the images was thought to honor Him, as being a fitting symbol of His great strength. But it is not hard to see that such a symbol in fact insults Him: for what idea of His moral character, His righteousness, goodness, and patience, could one gather from looking at a statue of Him as a bull? Thus Aaron’s image hid Jehovah’s glory. In a similar way, the pathos of the crucifix obscures the glory of Christ, for it hides the fact of His deity, His victory on the cross, and His present kingdom. It displays His human weakness, but it conceals His divine strength; it depicts the reality of His pain, but keeps out of our sight the reality of His joy and His power. In both these cases, the symbol is unworthy most of all because of what it fails to display. And so are all other visible representations of Deity.”
– J.I. Packer, Knowing God, p.40-41