I feel the photo is spoiled by the stones on either side of the metal sculpture.

the blocks on the side are a bit over-powering. maybe a closer and higher vantage point to the center object (with the curves).

I like the use of shallow DoF in the background.

this is very nice. love the view through the curves.

I think a tighter crop on the side and top would help this one.

The subject feels too centered... and the top of the image seems to not be totally exposed. Or maybe there was some solar glare. Its an interesting shape and meets the requirements of the theme, but I think the photo is too wide and doesn't hold my interest.

this fits religion but not really curves

Jerusalem Curves?
Too bad the focus appears to be much crisper on the stones surrounding the main subject. I also would have croped the top of the image as to minimize the overexposed stones.
Nice idea regardless.