I think it's a little hard to read right now. I think it needs more darks especially on the city. Also the city needs a little bit more definition which would probably come through if or when you add darks. Since this is a stormy scene that would also help make the lights, like the lightning bolt, pop. Compostionally it's looking great. I really like the detail on the water thats up close! The Titan looks really cool too! ^_^ Good luck and have fun!