I agree that the sky is too busy. Also, your color scheme doesn't work for me. The musty red of the sky, the green of the glass, the ice-blue and white of the rock or iceberg. If the glass was more clear than green and the rock was more grey/brown.... One other thing: the darkness of your sky and the amount of light shining on the rock don't jive. I'm looking forward to seeing how it evolves. 8o)