I have to agree with Trevor here, the exhaust could use a tone down, perhaps aseries of dark brown washes, but all in all you have a very good model here. I recomend a dark, dark brown wash on the tracks to add some depth and dirt, and think you could have scored a knock-out with an oil pin wash on the upper hull to make the rivets and access panels "pop" a bit. I do want to say this is all constructive feedback and that I am impressed with what you have done, good job and I look foreward to seeing some more work!
P.S. just a thought, but it may be worth trying a slightly different shade for the interior to highlight the seperation. The exterior would have faded a bit faster than the interior and using a bit of artistic liscence it would make the working area of the interior stand out. just my 2 cents.