I am really impressed by this Chariot. The female driver is unusual; the companion book describes her as "winged victory, the goddess Nike or Maeve". There are no reins, only those ever-present red ribbons, harnessing the unicorns to the chariot.
What the artist describes as "the unicorns of the sea" remind me of some representations of the Chinese Ki-lin (Ki-rin, Qi-lin, Qi-rin). This creature, who is only outranked by the Dragon and the Phoenix, is described as "a deer with one horn, the tail of an ox, the hooves of a horse, and a body covered with the scales of a fish." (
http://www.pantheon.org/articles/k/ki-lin.html) Although there are no fish-scales in this image, the water connection is still there.
This description, from wikipedia, is very interesting.
Although it looks fearsome, the Qilin only punishes the wicked. It can walk on grass yet not trample the blades and it can also walk on water. Being a peaceful creature, its diet does not include flesh. It takes great care when it walks never to tread on any living thing, and it is said to appear only in areas ruled by a wise and benevolent leader (some say even if this area is only a house). It is normally gentle but can become fierce if a pure person is threatened by a sinner, spouting flames from its mouth and exercising other fearsome powers that vary from story to story.
The idea of purity in these descriptions, combined with the lack of reins, suggests to me the idea of mental rather than physical control. This is a concept that I usually associate with Strength, but I am pleased to see it here as well. Control of one's environment comes not from hauling on ropes, but is more subtle, arising from wisdom and self-confidence. There is also an expression somewhere between joy and serenity on the driver's face.
The other animals that I see are sea-turtles with spirals and suns on their shells; and a crab holding a sunlike symbol between its claws. I'm not entirely sure what meaning I can take from these. The crab is usually associated with the Moon card, I was surprised to find it here, in almost the same position. Unfortunately, I don't know enough about astrology to comment on any Cancer connection. The other thought that comes to me is that the crab and the turtles are creatures of water (emotion) while the winged charioteer is a being of air (thought). So the message would be one of staying above emotional influences.