This is a great image, however the sky is a little bright, if you look at either photographs or documentary film footage of any of the peaks over 8,000 meters including Everest you will find the the Atmosphere (IE Sky) gets darker with altitude and is the darkest blue you can get without been black. Any one here with a pilots license (Not me, though I do have an interest in aviation) will tell you the same thing, you can get to a point which is the edge of space 62.1 Miles (100 km) high but vary few aircraft can get that high.
Regards to you.
Cyber-Angel