I think shaving him a bit is a good idea. He's obviously on campaign or exercise and no cavalryman would be able to maintain that sort of show moustache in the elements. At very least it would droop wildly as he would not be waxing it. Glad this is heading commercial as it is a fine piece. Should do well. My personal taste is to avoid models with greatcoats as I like to see all the uniform detail but they certainly do add atmosphere to a sculpt.
Colin