At that size it's hard to say something definitive, but it looks nice so far.
My only suggestion - and here goes my
idee fixe - would be to make the "steps" (of the non-horizontal lines) of the "ribs" on the fuselage more "regular" relatively to outer contour and each other.
Note that after all they represent regular internal workings of the aircraft and in reality these lines don't go randomly (esp. they aren't spaced randomly one relative to the other), and also that the base drawings during resizing get bit deformed and therefore following lines of them needn't have to be too literal.