This could be a fun thread, Beanu. I just noticed it. But it's misnamed: the way you started it out, it is about Greek gods and goddesses, not Greek astrology. I'm not very up on astrology, or I would have checked it out before now; I know more about mythology.
To narrow the discussion a bit, it seems to me that only imagery available in Western Europe during the 15th-late 17th centuries, when the tarot was being developed, should be considered. Your Hebe, while impressive, is by Canova, late 18th-early 19th century. It could have been inspired by the card. What did she look like a little earlier? Also, we can't in general use Greek pottery or statues, because they weren't known until the 18th century.
I have lots of Greco-Roman imagery at hand that was, or probably was, available in 15th-17th century Italy and France, relating to various tarot cards. How do I put it up for people to look at?
Finally, what is your source for her being the original for Aquarius? All I find is Ganymede in that role. It makes sense--she had to go somewhere after she lost her job. I just can't find a source.