If a person can't see the forest through the trees, it's saying that the big picture is lost in some finer detail. Perhaps a perspective is honed in so tightly on one aspect of that person's viewpoint that they've foreclosed on the image before it's magic is allowed to come through.
How willing are you to change the way you look at things? Turn your head, invert your senses, and wrap your mind around an altered relation to the subject. Perhaps, even say, get a proverbial wrench and adjust your attitude.
Consider how many times you've heard, "There's nothing here for me", or "I'm not inspired", or "There's no good shot"? Next time any of these situations come up, encourage the option to stay right where you are and be in the nothing, be uninspired, be disappointed. Hang out, soak in it and be curious. Try entertaining the possibility of "What if?"
If a person can't see the vineyard through the leaves, it's saying that it's time to refocus your attention, and who knows what you'll see. Maybe more leaves, maybe the vineyard, and maybe just a little of both.