It's because they've become so good at drawing, writing has become somewhat useless to them, so they haven't really got the time to practice their handwriting.
And above all, the better the artist, the more original and creative the personality behind the art and, graphologically seen, of course also the handwriting more unusual, illegable.. the graphologist speaks about high formlevel so their handwritings are not "bad", on the contrary they are very good as expression of higly evolved personality in many cases.
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Artists from ancient Greece were the biggest influence for the Roman artists.
Byzantine artists were the first Western artists to develop the use of abstraction.
There have been hundreds of artists that have painted rivers. This is one very popular landscape for artists to paint.
Those have been used for drawing by many European artists, but most famously by Chinese artists.
No, the Minoan civilization