1) It's climbing according to the photographer yet you can see inside the engines
2) It's pitch black with the light behind the plane yet you can still read G-VBLU on the bottom of the wing
3) You can read G-VBLU when the plane is 9,000 ft up (again according to the photographer) i.e. at least 2 miles away
As well as a host of other reasons based on him saying it's climbing from 8,500 to 9,000 ft over the middle of China.