I think this is a lovely picture. It somewhat reminded me of "Avatar: The Last Airbender". Granted, that might only be because a picture of Aang is in the related stuff. I couldn't help but think this was a reference to some mythology. I can now understand it more that I've read the author's comments. Yeah, those are even important in art pictures.
I just loved the way you depicted such an oppurtunistic world. The shading is absolutely flawless. I'm surprised it does not have a higher rating. I don't know why an arch would be in the middle of the sky, but it's awesome. I hope you have a wonderful life as should I.