I really like that this isn't perfectly symmetrical, and it's drawn. It's too easy to flip-and rotate imagery in PS, instantly doubling the size of a canvas and creating a mirror image. This is so much better for not doing that, and for not being perfectly vertical either. The angle of the heads and the variation of skulls make this, of the probably thousands (or more) of skull depictions on DA a really good one. Everyone tries to be cool. Some succeed.
I'll tell you this, I'd be shocked all to Hell if this had turned out accidentally perfectly symmetrical. And yeah, BINGO, doing this digitally would have been taking the easy way out (or not, as I'm not Photoshop or Illustrator-savvy).
And really, I wasn't about to make every skull look the same, because, well, not every skull looks the same. . In this manner, I was influenced by certain primitive cultures and ossuaries.
In the end, it's all about aiming for perfection using what you have in front of you, and settling for excellence if you can attain it.
Thanks for your dead-on observational comment. It's actually the kind of thing I would have said!