Looks excelent

I'd make 1/2 changes if possible, though...
add more little decals (warning labels, triangles etc) all around to add some more detail..
make the bit joining the engines at the back a lighter shade, possibly make it look 'ribbed' or 'corrugated' (can't find the right words)
finally, there is one thing that I do that you may want to try... basically, I add an extra layer (in PSP) over the texture map with around 50-60% transparency. Then, I draw on lines to indicate 'plates' of metal all around the craft - this makes the surface seem a lot more detail for less work than you'd think.
an example map (from the Cherufe);
(onviously this depends on your mapping technique)