Well, first off the water looks a little rough, and very blue. Maybe you could try to make it
so the water looks a bit more smooth and lighter. Kind of like shaders. Also you could add a bit less reflection to the water. Second, the shadows seems very dark to me. Maybe you could brighten that up. And last, The blocks seem really bright to me. I don't know if you were trying to make them look like that but it looks like it is plastic (to me).
