I just slaved over a copplestone Naval Brigade. I was pleased with them...until I saw that pic. Now I think mine are sub-standard!
Funny as I just painted up a small squad too based off the same pic and some research. I actually tried using a slightly darker blue than the Foundry Deep Blue as Navy is so dark it almost looks black. The color turned out nice, but the blue was so dark that the black neckerchiefs are almost invisible against it, which doesn't look great. I think maybe that's why KD went with the slightly lighter Deep Blue.
Also, painting the neck area on these figs is very complex. There are three layers--the back kerchief (don't know the proper name for it), the firing lanyard, and the neckerchief. I practically went blind trying to trace what was what in all the complicated folds around the neckline!
Keep in mind that you can also paint these figs in all tropical white for hot climes or a combo white and blue jackets and trousers.
AX