OK, my views on the photo: [Please don't be 'personally insulted' by my comments
* The picture has a blue cast - the whites aren't white, especially around the cockpit area.
* Your colours look muddy, the reds and greens especially this could either be bad scanning or too much JPEG compression.
* Not enough depth of field. The picture looks odd because the wings and engines are dead sharp but fore and aft the depth of field has fallen off sharply. My guess is you had quite a wide aperture on the shot. If you don't believe me then check the cockpit window frames and the area around the tail against the detail on the wings.
* You've cut the left hand side of the wing, and some of the left elevators as well but the right side isn't similarly curtailed. My first question would be 'Why didn't you zoom back a bit [or shoot a touch earlier] to get it all in.