I built a 1/32 scale Revell Spitfire MKI when I was 11. That was a LONG time ago. It looked very much like yours when it was done. (I had been building models with my dad since I was 5) Came out almost perfect. My dad's good friend was a scale modeler and a professional artist. He saw my model and said it looked really good, but it wasn't done. What? He asked if he could help finish it. I was 10.. What was I going to say?
He grabbed my paint set, some mineral spirits and a medium sized brush. Mixed up some very thinned black, gray and white and proceeded to brush that stuff all over my model. I just about shit my pants. But when he was done, it looked like that Spitfire had just flown 2 years over the skies of England and Germany. Weather marks on the wings, oil streaks, faded paint and the coup de grace... a little silver speck here and there on the leading edges where the paint chipped off.
Unbelievable.
From then on I "wrecked" all my models the same way.
John
EDIT: almost forgot. Very nice job, OP.