The building looks interesting with a lot of good images to be shot. As previous commenters indicated the image needs to be levelled.
I'd almost want to crop down to a stone work in the arch or other details. Otherwise you need to step back and get more of the church. As it was shot it looks a little too tight.
I also see that you shot at f/4 on a tripod. There's nothing wrong with that but you'll get better sharpness if you shoot around f/8 to f/11. Use a larger aperture if you want a shallower depth of field. (e.g if you got even close and focused on the detail in the arch the focus would fall off nicely).
In terms of the challenge? Yup its centrally composed. I think that was the easy part of the challenge. The hard part was a) finding a subject that was suitable for that sort of composition b) framing the subject where the composition was effective.
Overall? not a bad shot at all. A heck of a lot better than my first challenge entry on this site and better than most first timers. Welcome to DP challenge and I hope to see more of your images!