Hi Mischife,
You are doing fine. No effort is waisted if you learn something from it. I'm sure you heard the old saying, "You need to break a lot of eggs before you make an omelet."
Your face can be salvaged by carving it a bit deeper. But I say to you, no, don't fret any more over this piece. It is a learning experience and you should keep it to look back on to remind you of better ways to do it next time.
Now the problem you had with the splintering wood is a common one. An old west coast Heida Indian carving trick is to soak the wood in water for a few days. Submerge it, the deeper the better, and let it soak up some moisture. Then remove it from the water and let it dry out a bit before carving. This rejuvenates the cells of the wood and helps it be more pliable. I've heard of them soaking logs for a year or more before carving a totem pole.
Whenever soft dry wood is carved you need to have your tools as sharp as they can be. This is a good reason to learn to put an edge on your tools yourself. IMHO it's part of the craft and waiting to have your tools come back from the sharpener is a frustrating, time waisting experience. You read my tips on sharpening. All you need are a few scraps of wood, a piece of glass and some sandpaper of the right grits and some stropping wax. The rest is technique that you can learn. If I may say, persist in this and learn to do it for yourself. You wont regret it.
The sheep. You made the rookie mistake of having the grain go in the wrong direction. The grain should have gone up and down and not front to back. That way you would have had 4 sweet sides to carve and only the top would have been challenging due to cutting across the grain.
The detail you are attempting would be difficult for an experienced carver, considering the grain orientation. If you want to know how I would solve this particular problem, I would resort to a Dremel with a small round stone and grind the carving the way I wanted it. The stone would remove the difficult end grain and leave a smooth surface. Don't run the tool too fast or it will burn the wood. Slower speeds, gentle pressure, rapid movements will work best.
Cross grain carving is the hardest way to carve no matter what chisel you use and should be avoided as much as possible. You must learn to make the grain work for you and not against you.
Once again I say. Lesson learned. Keep it for posterity and move on to a new block of wood. Perhaps carve the same thing, only this time, use what you have learned and see what the difference is.
So much of carving is like making sketches in wood. Some are good sketches and some miss the mark we were aiming for. Try and think of carving this way and remember that if you even only learn one thing while making a sketch, then it wasn't a waist of time. You can't learn anything if you never make a mistake. As with anything, the more you do, the more you will learn, the better your carvings will be. So don't get all bogged down with pieces that go wrong. I'm not saying you should never try to fix anything. Sometimes the fix is the learning experience.
A rhyme for you.
Every busted bubble has a glory.
Each abysmal failure makes a point.
Every glowing path that goes astray,
Shows you how to find a better way.
So every time you stumble, never grumble.
Next time you'll bumble even less.
For up from the ashes, up from the ashes
grow the roses of success.
For every big mistake you make, be grateful.
That mistake you'll never make again.
Every shining dream, that fades and dies,
generates the steam for two more tries.
There's magic in the wake of fiasco.
It gives you that chance to second guess.
Then up from the ashes, up from the ashes
grow the roses of success.
Disaster didn't stymie Louis Pasteur.
Edison took years to see the light.
Alexander Graham, knew failure well.
He took a lot of knocks to ring that bell.
So when it gets distressing, it's a blessing.
Onward and upward you must press. Yes yes!
'Till up from the ashes, up from the ashes
grow the roses of success.
Grow the roses.
Grow the roses.
Grow the roses of success.
Yes, yes!
Grow the roses.
Those Rosie roses.
From the ashes of disaster grow the roses of success!
Lyrics by Richard M. Sherman and Robert B. Sherman
From the movie "Chitty Chitty-Bang Bang"
Always helps me out of a hole.
Christopher