Looks pretty good so far, but the textures REALLY need to be worked on. They need to a lot.... uh.... browner (if that's a word), like in the ref. pic.
And you DEFINITELY need a different skybox.
The sky is more pinkish in the ref. pic, and the clouds are a lot longer and cover a lot more area. And you should also show some of the far off buildings in the skybox as well.
The Man's Prayer:
"I'm a man, but I can change, if I have to, I guess..."