Hi Lotus Creative,
Thanks for the variety of entries. They have clearly involved a lot of thought. I really like the explicit reference to Gaia herself. I also like the concentric colour rings idea, though the orange is not working so well for me. Perhaps a cooler colour or a yellow might work better.
The images of the animals are really good, clear, well drawn and evocative without being too specific.
I prefer the image with Gaia at the edge to those with her contained fully within the circle. However, in those images, with her outline making the circle ragged at the righthand edge, I feel that the effect is a bit disconcerting. If we could give Gaia a righthand edge somehow but in a more subtle way than is being done with the additional blue layer, that would be excellent. Perhaps a shadow or a "lighting effect" or something like that would do the trick. Maybe that would work better if Gaia were on a different edge.
Finally, with the Gaia drawing she is oddly twisted somehow, with her buttocks and her breasts on the same side of her. That is also a little disconcerting.
I hope all that feedback helps.
Geoff Shuetrim