I think it needs a little work, if you want my opinion. It's definitely better than the first screenshots, but still needs more.
There isnt really much..
That's a problem. You need to MAKE some detail. You've already done a lot since you said that, but you've got to figure out how to add detail.
I think you've got a nice overall weathering layer (the "dirt" over all the OD) but you might need to blend areas together more smoothly. Like the exhausts behind the engines under the wings. Also there's a block of OD under the tail gun that might need fixing.
Don't forget you can also add oil leaks, gas stains, hydraulic drips/leaks and any other number of stains/drips/messes on the surface.
I'm not saying go overboard or anything, just giving some ideas.
See some of the oil thrown around some engines on this image:
http://liberatorcrew.com/06_B-24/USAF%20Museum/b24J-from%20464th.jpg(interesting to note: Not all engines leaked the same amount)
EDIT: The de-icing boots on the vertical tails look kind of odd too. They have a strange border/line between the black and the OD.