At first glance, this is a beautifully striking tessellating pattern well worthy of the greatest in the field. However when taking architectural images like this where the main draw is it's symmetry, you really need to be damn sure it's perfectly symmetrical.

Take for example the top right corner's triangle and compare it to the left's. It's bigger, and it's something that stands out like a sore thumb in images like this.

I think this is fantastic, nice shades and interesting to look at, but those simple errors detract quite a bit. Easy way to fix this is to open it up in PS, cut and paste half the image over the other with a low opacity and use it as a guide to free-transform it to perfection.