Really unreal, the experience in your hands gives to those good pictures an amazing meaning, and catastrophic circumstances, great work my friend. the sharpening effect on the mountains its consecuence of a technique of yours? or is the sharpening of PS?
Only the biggest planet is a stock, only becouse I didnt want to waste 2 hours of my time making the texture, and I would suggest to open a photoshop with same stocks and try to make a like -version, if you really cannot see enything but a mountain image and one planet there. Hell, go to photomanipulation category if you want to see what "using stocks" is really all about.