Great question!
I know I myself am a little unbalanced, but in this case I believe it is due to some mild barrel distortion resulting from the focal length of the lens in the camera. In fact, I did use a straight edge to make sure the lines are consistent.
Also feel free to criticize the crap out of any and everything I make or write.
Years of art school have made me appreciate good discussion.
At it's worst, I once had a guest professor compare some of my photography to images of holocaust survivors.
So, pretty much it's been nothing but roses since then!