To take something that is already beautiful, and then add your own personal touch to make it even more breathtaking is very close to impossible.
But what you have done here isn't just that. What you have done is taken what exists and made it yours. Imagination and possible realism existing side by side.
Great use of the source materials, and with an excellent experimental knowledge of PS CS5, you have allowed us to cross boundaries with your simple, yet layered artwork of your controlled imagination. If there is ever another creation cycle, I wouldn't be worried, God has you in his corner. And just maybe you were there when He created Earth the first time.
I love this idea, and the time and energy invested in this is undeniable. The amount of detail in the land masses is amazing, with use of ocean ridges as mountains, and the idea of the Pacific becoming a vast desert are all really awesome ideas. The mountain ridges and frosted areas look realistic and believable.
But there are some areas that I have some concerns over. The ocean areas don't appear to have as much care put into them, they seem kind of last minute to me. That, and the lack of frozen oceans at the poles seems to snap me out of my suspension of disbelief; as well as the lack of an Antarctic Ocean.
The second half, the night-time map is a really interesting piece of work, and show careful study of real-world maps and mastery of replicating such looks, while creating his/her own work.