Hi!
looks good to me! I have to say that I have no knowledge in RAF planes, so can't say anything about shape and colours.
Just two ponts I would change.
Your black is too dark. So shadows get lost and so it's not possible to "see" the plane in 3D. Lighten up, and the shape will look much better.
BTW: black planes are the most difficult planes to draw. Here one of mine:
Cheers,