Ah, that's what I get for posting pictures of figures that are 5-6x bigger than the actual figure!? Seriously, when I was painting that I could have sworn the only black I left was the open mouth... but now that you've mentioned it... and I looked again under a magnifying glass... yeah... I totally missed part of his lower lip!? It's fixed now, Thanks!
As for the colour of the jacket I have only two reference pictures. One is an earlier war Gerbirgsjäger what has a much lighter tan jacket, but it's of a completely different pattern (button up, no hood). In another volume there's a later war plate with a smock that's a little closer to what this chap is wearing, but it's darker and looks like more of a grey-brown. So I kind of split the difference... trying to make them more versatile. Others I was thinking do in a light grey ("lichen grey") - almost whitish... Perhaps the rest could be in a lighter khaki/tan.
These guys will probably see more action in Pulp Adventure games; garrisoning a secret base in the Antarctic... or racing against the players to discover the secrets of the Elder Thing city... or something like that... who knows what sort of kit the South Polar Gebirgsjäger Regiment would have had...?