Some suggestions for the panel lines & rivets
First off I like to do rivets in white. Seems like a personal thing among skinners, majority are black but many use white as well. Just something to consider.
For both the panel lines and rivets (while the rivets are still black-- I do them in black and then invert), duplicate the layer and use a gaussian blur. I set that layer to around 20-25 depending. This gives a look of dirt buildup around the panel lines, the panel rounding into the panel line, gives a bit of an uneven 'this is sheet metal' look where the rivets are, and most importantly cuts a bit of the edge off of the panel lines, which IMO (at least on my skins) look very pronounced and almost out of place without this.
Another thing I like to do with panel lines is use several (3-5 usually I think) panel layers with different opacities. These are doors, access hatches, control surface joints, plain old 'new panel starts here' etc... gets rid of the monotony a bit.
Also the paint wear is a bit heavy.
Don't get me wrong... it looks fantastic. As it is now are definitely worse skins in the game.