Wow.
From an academic purpose the sexualisation of Artemis is not remiss, she is a goddess of fertility after all. The main reason her statues are conservative are simply because that was the style at the time, a proper Greek woman would never show much flesh in public, and no women were more proper than the gods. Her sexuality is present in her stories however, so its simply a matter of the subject being adapted to the art style, rather than the other way round.
On the other point that has arisen, Ireland did in fact have a functioning culture at this time, simply because the Greeks looked down on the 'barbarians' of northern Europe doesn't meant that there no culture there, it was simply present in a different form. On another note, the Greeks did not have castles and grand temples in 5000 BC, it would be many many years before large structures developed in Greece, after they were influenced by movements in the East, from Anatolia, Egypt and Mesopotamia.