A great start, I'll dare to say, but there are some technical details that could use some more work.
The hair is a lot lighter than on the coresponding skin, and the beard is covering a little more of face than it actually does.
The mouth is, unfortunately, lost somewhere in there, and only a slight pink touch and few teeth are visible, but it could work this way.
As for the eyes, why are they all covered in green? Maybe they aren't, but the coloration method you've used gives that impression.
I
know this is a fitting icon, and that it will get approved, but why not to put some love in it?