To be honest, one thing stands out to me is the dry brushing! Dry brushing over camo is almost impossible to get acceptable, never mind get perfect. All edges and seems are drybrushed with the base colour and this breaks up the camo design. The green and brown of the camo are brilliantly faded, which makes the edging stand out even more.
Maybe if 50% of this was returned to its original camo colour and 50% of the drybrush effect was left it would tie itself more together. Maybe a light wash/filter/stain, of the appropriate colour, over the drybrushed edges, so the effect is still there, but the greens and browns are connected might do something.
Another thing that comes to my mind as I write is that the green and brown are faded but the yellow still looks the same! Maybe its just the fotos. Maybe some scratches on the camo, showing the base colour and some scratches on the yellow showing rust/bare metal might help.
All this is "maybes"! Its hard to tell somebody what they should do or how it should look like. It all depends on what you want to portray... and its you that has to decide on what you think is right. If your happy ---- its right!! Maybe this is just some food for thought!!
I had to look at the pics closely to decide what "I" might do if I was in the same position. Id probably leave it alone and be ahppy enough with it. These comments in no way are meant to retract from the model you have built. I think you have made an excellent job here, but I was only throwing my 2 cents into the thread. All the best!!