Thanks for your entries!
I don't comment on all versions so I picked my favorites:
Best realistic:
wkraus and
Glenn5995. Both good white balance and exposure. wkraus a little better cropped, Glenn a little better contrast.
Best artwork:
Todd (first entry), and
D1N0. Not what you usually see in aurora images, but i like these a lot!
Best creative:
astonm, and
Arizona Dave (second entry). astonm: A very good idea very well executed. Dave: A fun little planet!
And ... the winner and next challenge host is ...
D1N0 !!
Very good colors and contrast. Not realistic but still not overdone. Good Art!
Congratulations!