Very cool, is this Korean or American hornbeam?
If i could make one critique... I have to say the trunk is kind of distracting, the way is positioned in the second pic, the left side is very straight up and down, perpendicular to the ground. And on the right side, closer to the base you have some reverse taper going on. I think you can still fix these things though You already started a big carve job, so why not fix that reverse taper with the carving. And possibly consider adjusting the angle of the trunk so the left side isn't at such a harsh 90 degree angle. Just my 2 cents though. It was hard for my eye to wander off the trunk to appreciate the rest of the tree.