the black mass on left is unbalancing, too heavy: I would rather just have the sky alone. the people silhouette may help to balance but as it is, too insignificant and too close to the centre.
I dunno if this is a crop version, which I suspect is not, and therefore there is no more room for other compositions. And also I do not know if u have other shots as the boat moves along changing the perspective.
Overall I think it needs a new perspective altogether. The great light in the skies can't save this pic.