Comet Dust and the Gender Divide

Received 90% of male vote. Book Cover Appeal: Men and Women are NOT Alike
Most of us are vaguely aware of this fact, but I was gobsmacked by it over the weekend.

Anyone who has followed my writing for a while knows how I like to experiment with book covers and titles. Hence, my new novel was called Days of Darkness for barely a week. The new title is Comet Dust. 
You'll recognize the same 'Brunette in the Wind' from the original Days of Darkness cover. Over the weekend, I came up with an alternative cover, 'Purple Starry Head'.  
The two covers are designed to give off different vibes.  In the aftermath of a comet hitting the Earth, Brunette in the Wind plays off of the ongoing chaos and decline of civilization. On the other hand, Purple Starry Head captures the main character's determination to hold onto her dreams and work for a brighter future.
Received 90% of female vote. Anyway, I conducted a very scientific poll to gather input. It consisted of me emailing family members and asking random people on the internet to choose their favorite cover. Thirty or so people replied back. Age range: 13 to 59. About two-thirds were women.  
Since I didn't intend the poll to be a study of gender differences, the results surprised me. Only one male voted for Purple Starry Head. Two women voted for Brunette in the Wind. That's a striking gender divide. I'd love to know the reason. Do you think it's just a color palette thing with Comet Dust or something deeper? Feel free to comment below.
What I have taken away from this is that men and women have very different tastes. Duh. Of course, they do. But what does it mean for me as an author? 
The poll tells me that I should use a target market approach. When facing the apocalyptic fiction crowd, which has a strong male readership, Brunette in the Wind is the obvious choice. If I'm going after a female-dominated genre like paranormal suspense, I should probably go with Purple Starry Head. Lucky for me, changing an eBook cover on a whim is super easy. Hurrah for the digital age!