I Really like the idea behing the image, and i really like the image itself too, and the colors, but, there are a few thing that i think is you work on, it will make your art even better, such as, play with warm and cold colors, i can see that you image is to, cold, yes there is hot spots, but try to do some, cold light and hot shadows,push more , you can push you values too, but, i really love the image, and the perspective of the building, is a really hard thing to do, Congrats on your piece
im not feeling much of a narrative though i see many elements of archticure or sense of distance with the occasional rendered tree lines or other natural landscape. its still a little flat in scope. my suggestion for that is focusing on the bottom of the river and rendered real detailed and then contrinue to smooth it out as it goes furthur, it should imply more distance as a visual effect. lighting for the foreground is good but the midground could have more love from the sun's light. like those mountains could have a layer of shadow to give realistic composition. I believe your colors are well picked, I could only imagine it looking cooler with different renders of objects in the scene.
I overall like it, hope these thoughts helped cause i came away learning something myself.