I would add some minor wear and tear. Maybe just around important access panels and such.
Okay, from the other thread I think somebody said there were no underwing roundels on the black hurr2c. Kev367th said "No lower roundels on this one." So I'd take those off. Leave the others, just remove lower ones.
Can you locate what part of the bitmap is being used for those white gun boots? Is there a way to make those black as well?
Also concerning the guns, there's the color photo of the real plane in flight, and the barrels are all black, not orange and then black. I don't remember if you can change this or if it's hard-coded. I'd suggest making the orange shrouds black. Maybe a light grey if they were supposed to be rubber or cloth shrouds (I don't know).
The 4 staggered holes on the underside of the wings are shell ejection chutes for the .303 guns. I think you'd only have 2 per wing with the 2x20mm armament setup. Check the default hurr2c, see what it has (I don't fly it enough to remember).
One last request: Play with the cloud layer. Try to make it less noticable. To me it's okay as-is, but I think maybe it could be better. Just a request, not a suggestion. Maybe play around with blending or opacity, and if you don't find anything else you like, leave it as-is.
EDIT: P.S. check the layer ordering. Make sure the "ribs" on the tail are underneath the other layers with codes. It looks like they're on top of them, dulling them out (hard to read the EB500).
Also EB500 looks to be the same yellow as is on the roundel:
