what a beautiful artwork!!
i think you made a wonderful concept art here, the thing i like most its for sure the composition and the color combination, putting those warms colors upon the cold ones, im also amazed for the details in the destroyed city, for sure you did a good work... but also i found, some elements found in the concept art of assasains creek, i think that youve inspired by those artworks, i mean, i think i have seen exactly the same painting idea in those artworks, the character concept, also looks so familiar to A.C character.

in other topic i can say that i loved the textures, especiaally on the character, its notable that youve efforted more on the character, and then the city and the clouds, looks amazing, but looks less worked that the rest..

in conclussion, i said that its a quite good piece of art, but needs to be a little more originality, and cause of that the impact tooks less relevance, cause its like a repated idea...