The Bible is Art is the website to accompany the YouTube channel that explores the literary art of the Bible.
Head A His head and hair were white as white wool, white as snow; Face B his eyes were like a flame of fire,
It is commonly observed that Revelation is cyclical, covering the same period (normally from Christ's 1st to 2nd coming) from different perspectives.
Why is the voice behind John? The book of Revelation is about revealing, unveiling what we do not see but is there. This dramatic action embodies that principle.
G.K. Beale has a great article on The Gospel Coalition Blog about Why Is the Number of the Beast 666 in Revelation 13:18. I wholeheartedly agree with him but think that there is a layer that's missing.
There is a beautiful chiasm in Revelation 1:14-16 that Victor M. Wilson points out in Divine Symmetries: The Art of Biblical Rhetoric.