Actually thats pretty nice for a first. Being a weathering junkie myself I don't mind the world weary look.
It does look like your airbrush pressure may be too high, resulting in the bumpies. I usually finish with a satin coat for modern aircraft. If you can find the Testors clear satin acrylic I can recomend it.
Washes are a pain, but since I've discovered using a pastel wash things have gotten much easier. Basically grind some pastel dust into water til you get a thin sludge. Paint in onto the gloss coat (always wash over gloss unless you want a really dirty look) let it start to dry them wipe off, remembering to never wipe parallel to a line. You can use a q-tip with a little water to wipe those tight corners.
All in all, a nice job.