I'm going to point out a couple of things I've noted and in response to one of your notes:
The L on the wing appears to be metal to me, my reasoning is: look at everything else painted white on the aircraft. It's very clearly there (which brings me to another point after this), while the wing L has no white to it. Even at an angle, you'd still be able to make out the white. Further reference is with the 2 on the rudder. It stands out, and that is on metal. If the wing L was white, it would really stand out due to the surrounding black.
The L on your wing is thicker, slightly "longer"?, and appears slightly off (a bit far to the right inside triangle) vs the L on the wing in the photo. The one in the photo is thinner, shorter (smaller), down slightly, and over to the left more inside triangle. This is what I'm seeing anyway.
The other point: The "white" de-icing stripe is missing from the tail on your aircraft, where it's quite visible in the photo. At the very least in the photo the strip matches the color of the L and serial number on the tail.
Mind you, I've only gone off the photo you posted as comparison.
