Regarding inspiration, this sounds kinda fruity, but it works. I watched a really amazing chainsaw carver at our county fair once. Big, burly, lumberjack type of guy. He got ready to start a new piece, and he put a stump up on the block, stepped back, with his arm propped on his 48" bar chainsaw, and just stared, silently, at that stump, for more than a full minute. Then, he said, "That's an eagle." Revved up the chainsaw, and sure enough, about 20 minutes later, there was a beautiful eagle sitting there.
I've tried it since then, and it works, at least for me. If I feel like carving, but I don't know what I want to make, I'll pick up a block or branch that looks good to me, and then I'll just sit and look at it for a few minutes. Sure enough, I always figure out whatever is inside there that I'm supposed to get out.