Oooooh nice. I really love the color selection you've chosen and the sense of depth. You did a great job with the highlighting and the shading. The texture is also very good. I can tell what's supposed to be smooth and what's supposed to be rough, I get a sense of that from looking at this.
wonderful composition of white,blue and black.. it look like a real ice.. and the way you bend the tower shows like it really tall and came from our imagination only..