AH1 never had a B-24.
Well, there are a few comments I could make.
First, if you find there is horrible stretching around the cowlings, for example, try to limit the detailing you put there. It looks like you tried to put some streaking around the cowlings but it looks wrong because of the stretching. Work around the problem areas.
Second, look at the default skin layout better. The de-icing boots are on it somewhere. [Edit: at least, they SHOULD be!] They may be separate. When you find them you can split them half grey, half olive drab, and with a bit of tweaking you can get it working right. I had a similar issue with the old Hurr1 skin layout (yellow ID stripes on leading edges) and I got it working in the end.
Third, you have this very speckled look to the overall appearance. It doesn't look overly smooth or clear. What program did you use to save it as 8-bit (256 color)? I would suggest Bright. It works as a plugin for Photoshop (and possibly other programs) but barring that comes in a DOS-based batch file setup as well. It will take a RGB full color file and produce a 8-bit file. It may help the quality of the end-product immensely.
Fourth, if you check out the skinning tutorial link in my sig, it will describe how to get the skin to show up offline. If you want to submit it to HTC, there's a description in there as well of how I do it.
Fifth, it's lacking some weathering, exhaust stains, oil drips, smears, shadows (as you mentioned) and aside from the speckles in the green on the bitmap, doesn't really have much in the way of breaking up the solid colors.
Once you get it in-game you could also post some more screenshots (more angles, top, bottom, other side, etc).
Hope that helps!