Excellent work for a first attempt. Everyone will have their own tastes and opinions. I would say try toning down the colours a bit to give it a slightly more faded look which should make it look more realistic. Also most of the rivets need reducing in size. The scale size of the ones on the upper wings is about the size of a golf ball. Again, as Serval says, reduce the opacity of the rivets. Most fighters used countersunk rivets which are barely visible when they have been painted over.
Simple rule is to look at a photograph and paint what you see and nothing more. If you cant see the rivets, dont paint them, or if you do, make them very barely visible. Sometimes less is more, if you know what I mean
