hi, i would re-enable the old dirt-layer on _1 and move the dirt-layer on _2 on top of the livery, otherwise it looks too "painted".
maybe also moving the "outer" letters on the tail a bit more inside cause they look like a bit close to the edge on. and unsharpen the bleeding edges a bit, for example like i shown on ex4.
but so far i can say, you have done a really good job on this! :thumbup: