A few things I noticed.
1. The roundels.. One side on some of them seems cut off.
2. Panel lines.. Did you do a white layer and offset for depth?
3. Gun smoke on the lower wings.
4. White edge on upper wing only?
5. And before Krusty says it, your white is too white.
6. Under fusalage band is missing as it wraps.
7. Try adding a few oil leaks. Some chips around service panels etc..
8. Your cloth marks should not extend into the trim tabs. Also need some work on the actuators.
9. Your underside needs something, definition wise, its too uniform a color. I like your upper surface, but the lower is too uniform.
Not being critical to be mean, but to assist. I haven't seen you skinning before and I appreciated everyone commenting on my skins as I learned.
[edit]
Also your fusalage roundels do not match from one side to other in the top shot. Check the squadron plane codes, the starbord side should have the squadron code aft and plane code forward on most RAF birds.
