I see this one in square format, even more centered than it is, with a tiny bit more on top and enough on the bottom to make it symmetrical. If there is a natural frame above, I would exploit that.
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Deleted User{K:2231} 4/14/2001
My initial impression is that this shot would be better in a vertical format with all or more of the trailing gown shown.. maybe similar to that of a wedding dress shot, where you want the whole trail.
Did you consider a light source from the other side of the wall coming through the opening? Perhaps this might open up the shadows on the girl, make her more center of the image, and produce a nice effect? Just an idea to try.
I'm going over to look at your web site now... post more images!
This is a promo shot so the success or failure of this image will be determined by the ticket sales. It does suggest a mood of fear or terror; however your models facial expression contradicts that. I visited your site and see you have a passion. Get some books out of the library and study composition. Get out of centering everything. also since you like to shoot buildings, a book on architectural photography will solve some of the problems you are encountering. go at it.