Nowhere in the art world that I have seen do Angels have the female form
What do you mean? Female angels are EVERYWHERE in modern art. A friend of mine collects angel figurines, and nearly every single one of the dozens and dozens that she owns is female in appearance. The very few males she has are mostly cherubs. I myself very rarely see male angels in any modern depictions of them. Here, just look at what I found during a quick Google image search:
I once asked a JW lady I was studying with why angels were more often than not depicted as female. Her response? Satan was using his influence over artists, sculptors, writers, etc. in order to make angels appear weak.