Wow, those're some crazy clouds you've got going on just above the horizon.
But anyway... I honestly think that - maybe excluding the addition of a very non-attention-grabbing terrain - that adding anything more to this would take away from the beauty you've achieved with very soft colors and lighting. Even adding the mentioned terrain could degrade that, adding more highlights to the image and kind of breaking that large gradient of light and dark.
I don't even know if that made any sense. It did in my head, but I figured my normal, 'Dat dere shore looks gud!' needed to be tagged out for once.