The art description was purposely vague:
This is an abstract piece. Show a circular design that interlaces braid and knot patterns with imagery of Shadowmoor elves, European animals, and astronomy (sun, moon and stars). It should resemble an ancient Celtic knot design. This card is about rebirth and the cycles of nature; symbolism should be about revolutions, orbits, seasons, and life/death, night/day duality.
Here's what they came back with
The creative team was delighted, of course, and would probably have accepted any of the three options. They went with C, leading to this full-size work of art:Wheel of Sun and Moon art by Zoltan Gabor & Boros Szikszai
And here's how it looks shrunk back down to card size: