Sad. I find the vignetting a bit too artificial for this image. Perhaps using the paintbrush rather than a preset, so you could be more accurate and subtle?
The bleakness of this is remarkable. You took a common scene, added to it, and made a photo that fits the challenge exceptionally. I wonder how many will notice the two individuals upon the beach, but this is my fave for the challenge and I'm giving you a 9.