Hi Alice,
It's not an easy task to do a face in relief.
That said, your face is very very nice, so nice that if it were mine I would leave it like it is and finish it with real beeswax softened in mineral spirits and applied with a toothbrush. I then would let it dry for a day and then buff it with a shoebrush, maybe even give it several coats, -- but thats me.
Then, after you get a good base of wax, if you really want to get some different contrast, in the relief grooves you could put a small amount of brown shoepolish, again brush it out. This takes some experimenting tho.
(you can get a chunk of beeswax from someone who raises bees.) Again, more of keeping with the natural. You could also use minnwax pastewax but it's not the same. I experiment with different things to try and keep things natural.
Always try finishes or wax etc. on scrap wood before applying to your finished piece to see if you like it or not and to get the feel of it.
Most of my faces have no finish whatsoever, now that's really natural.(smile)
I am sorry, I should have given you a more specific address to my site. You cannot use www, just type this on your address line.
http://chiseler.tripod.com/
or just click on this link, I think that will work ? When you get to the page with me sitting and carving then click on Carvings on the tree. Then click on a thumbnail to enlarge each picture. Let me know what you think.
I do not know how to post pictures on this site so if you would care to see more of my work you will have to send me your email address in the private message section. I also do large reliefs, sculpting, carved furniture etc.
I Hope I haven't rambled too much and that some of this might help you in some respect. Later then - John