Refused for technical reasons.

You don't know what your customer's want.   The long shadows and insufficient exposure ruined this image for commercial use.   Save the experimental stuff for galleries and photo sharing sites. 

Stock is neither a gallery nor a photo sharing site.  It's a business. If your photo isn't fit to print on posters, t-shirts, calendars, magazines or billboards ads, it will never be accepted by Stock.  Sorry if that's not what you want hear. But at least now you know what customers expect from contributors.

Hope that helps.

If you shoot a photo with a defect, and have to explain the defect, your photo is already failed for stock. There is no way to explain about your artistic intention. Good art may sell well, but it must be technically perfect in the conventional way.

First sight critique: Highly underexposed.