Very handsome figures, and your painting does justice to the guns too, for which I had the pleasure of sculpting the master models for Michael Perry a few months back. (A mitrailleuse and a Prussian 4-pounder are also with Michael and he's sculpting crews for imminent release.)
The rolled greatcoats were actually the same colour as those of the French infantry. ie a dark blue-grey. Officially this colour was described as "blue-ish iron grey", and it was woven from 90% indigo blue threads and 10% in the beige of undyed wool. The result appeared somewhat more blue than grey, but still distinct from the dark blue of other uniform items.
The wood of the guns was no longer painted in the yellowish olive colour we all know from the First Empire. By this time it was what I'd call bronze green, ie a dark green with a touch of olive. The way you've done them looks close. The same paint was used for the wooden parts of gun tools such as the ramrod and trail-spike, strictly speaking.
But never mind any nit-picking comments, you've done a lovely job on these, Rafa!