The rejection reason is the following (don't know which shorthand it is, so here's the full paragraph:
The photos were of low esthetic qualities - bad angle, included
window reflections (for shots taken through glass such as terminal windows),
pictured just a part of an aircraft (with no motivation, like a special
sticker, damage etc., for doing so), out of focus, distracting or
obstructing objects in the foreground or similar (this is especially true
for gate shots which are very difficult to get accepted due to their common
nature and the large amount of ancilliary equipment which usually surrounds
the aircraft) or did not picture an aircraft or anything sufficiently
related to aviation at all. Finally, you might read this because your camera
displays the date in the lower right corner of the image. If so, please
disable that feature in the future.
I guess that's what happens in the end, you start thinking about the beginning.