That looks like a really nice paint job!
Freehand in 1/72 too - very well done.
If you don't mind me saying, I think the u/c needs a bit of tidying up - try to get the 'flash' off the parts before you go in with the paint.
Have you hand-painted the undercarriage and weapons?
If you have, I'd say spend a bit more time on airbrushing these parts to bring them up to the standard of the main aircraft because that really does look nice (did I say that already??
(In the case of the wheels, spray the hubs white (or green even!) and brush paint the tyres black is my usual approach).
What paints do you use by the way?