Perhaps a person lit by a flash woudl have been nice to see on the left... perhaps in a contemplative pose? ...je ne sais pas.... The line in the center is pretty strong.. too... A couple kissing here maybe? ... just ideas for the blank space. The texture is nice, your right, but nice for a background. In my opinion. Lots of potential. I like it for what it is alot.
If your ever there again... try the shot again with a subject in the blank space... break that bold line perhaps with a shoulder or arm or somthing. Im wanting to see A couple kissing here in the left... or somthing special yet hidden.. a moment. Stop down a bit to make them in focus... focus midpoint. GO back and shoot it again!