The shadow streamers just above the horizon are the strongest part of the image. Though it was your specific intention the silver lining is overexposed. If you could have "narrowed" the thickness of the silver lining it would be more effective. The foreground does not have a lot of interest to complement the sky. If you could find buildings or vegetation to frame the sky center to a much larger degree it would add a lot of interest to the composition and justify the large amount of foreground silhouette you already have.