Where's the tracers? By the way, if the right wingtip vortice is going to be that defined, the left one should be somewhat similar. The way it's setup now makes it appear as if the Spitfire has lots of lift on the right wing and a, "droop" effect on the left.
You might also position the aircraft a bit further to the bottom left of the screen, or move the bombers further towards the top-right of the screen. For if the wingtip vortices are still at the wingtips it means the pilot is still pulling the stick back, and at the plane's current position would indicate a pass over the bombers as opposed to the head-on pass.