Similarities or influence/inspiration? It is plausible IMO even if not proven. And makes for a more plain-of-day explanation than I see in most theories of the unusual (revolutionary?) iconography. With the campaigns of the 18th Dynasty Pharaohs, I see an ‘opening up’ of Egypt to cultural influences from outside. Empires are changed by those they conquer as much as they change the culture of those they conquer.A link to the work mentioned by Ayrton: The Beautiful One is Come: How Bride Exchange Helped Create Amarna
About this work, I find curious this new iconographic path: the Mitannian depictions of deities would be similar to the way they depicted Akhenaten and Nefertiti in the Amarna art. A clue that the Beauty came from Mitanni?
Like for the Canadian author, my knowledge of Semiotics makes me cautious about similar lines of inquiry. Nothing would have impeded to the artists in Akhetaten to imitate a foreign style [even if, checking how they represented the goddess Arinna, I'm not that persuaded that there are great similarities].
If a Mittani influence is seen at all, then do we look for a Mitanni Princess from earlier in the dynasty (pre-Amarna) down whose Royal Egyptian-Mitanni bloodline we find Yuya and his ‘foreign’ looks? So both Egyptian and Mitanni royal blood flowing in his reign. And a Mitanni influence in the way Aten transformed itself? Some ‘foreign’ Influences also showing up in later iconography? Not a program of mine, just some thoughts thrown into the mix.