It may not look alot different at a distance, but I made the following changes.
Redid aluminum all over the plane.
Redid the wings, they were panited grey not aluminum.
Redid the green, weathered it, and changed shade slightly.
Redid the red group markings.
Redid the chipping in some areas.
Redid the gas caps and adjacent areas.
Redid the stains.
Redid the stars.
Redid the green antiglare shade and aged it.
Redid the plane / group codes.
Redid the invasion stripes.
etc etc etc