You are right with the not delivering part, and you were mistaken with the tone of promise part. The grey sky is a problem. The small size of the birds another. Not sure how fast your shutter speed was, but apparently not sufficinet to stop the motion.
While I don't disagree to the viewpoints of rashkae and deadpoet, I do believe that the pic's potential can come out screaming through creative touches, despite its unaspiring raw form.
Drama, why not consider cropping it to get better a more soothing perspective, before applying certain artistical effects to it? The latter can mask the boring background as well as the blurry image of the birds. Thats what I would have done to this pic.
i dont think creativity can really salvage the photo. There is just too much wrong with it.
> the grey background: its boring, there is no reference point
> grouping and size of the birds: they are too small to have any detail but too large to create the swarm feeling. If you would have one or two birds filling the frame it would be ok, or lets say 10-20 in a group that takes off... but like this its neither nor.
> 99% of the pixels are conentrated in a very narrow band. There is no white, there is no black, in other words no contrast
i would go with Deadpoet: Trash Can and try again.