Carving, for me anyway, is a two-step process. I expose the wood I want to make deadwood. Let it be for a while, then come back and carve it. The longer I can wait, up to three or four years, to carve the deadwood, the better the results in carving. Carving newly exposed wood is a mess and the results aren't as convincing as they are on dried wood that's had some seasoning from weather already. Also, that time span can actually be a great help in carving as the wood will naturally split and crack on its own. Those natural stress points can be exaggerated by carving, instead of the arbitrary cracks and hollows that you have to artificially create with newly exposed wood.