I thought we depicted God with a human figure because of how the Book of Genesis, and some of the other books of the Bible, describe His appearance. Most notably is the verse in Genesis, in the first chapter:
>And God prepareth the man in His image; in the image of God He prepared him, a male and a female He prepared them.
If He made us in the image of Himself, I'd imagine He has the same anatomy as us.
If we want to get into specifics since you're talking about Western Europeans depicting God "as themselves", are you talking more about race? I feel like they've just depicted God as a White because God Himself lacks any phenotypic qualities of race that we know of, and since we were made "in His image" they just thought "Well, this is how we look like, and I doubt many other folk from around the world will see this painting and then delve into the particular detail of the racial features present in my art." You could depict God the Father as an African, a Chinaman, a Palestinian, and since we're all made in the same anatomy of God (His image), all of those, as long as the human figure is kept, since every race is just a subspecies of the human species that was made in His image, would be accurate, at least from what I'm thinking (and I may be wrong about how we depict God, who knows. I'm not always good at talking about this stuff). No doubt that, in depictions of God where it's the Son, obviously it's better to keep Jesus' appearance more phenotypically and racially accurate to reflect His humanness, but honestly I don't see what the big deal is with focusing on how "the Western depiction of God" is really just a front to project our human nature upon God's perfectness through the use of portraying him as an Aryan man. I don't see it as the intention, nor as what's at all happening here in the art. I guess art and depictions probably have a bigger importance in your theology, doe, since you're an Eastern Orthodox and you guys have a lot of art in your churches in the form of icons.