I met the GreenMan the other day for the first time, it's hard to tell if he's coming or going. What struck me is the sort of between worlds, neither here nor there, the illusive, elusive quality about him... it's like he's emerging, coming into focus and yet could simply disappear into the woodwork.
It sort of reminds me of a chameleon, that ability to blend into his surroundings but has enough personality and individuality to stand out. He is in and of his element, at one with his world.
I"m trying just to read him as he is without thinking of the Fool or even 0, because he is un-numbered. But in a way he is full of potential, that is just beginning to be noticed and seen, given more concentration and focus he becomes more formed and distinct. That without a sense of awareness and attention to detail, he could be passed by without notice.
I would think that this is using the resources around you to either stand out or as a defense... or as an indication it is time to emerge and show yourself.
That stare... I think is seeing through the outer appearances and into you, that he sees exactly what and who you are and perhaps that is why it feels a bit squirmy and uncomfortable under his scrutiny. He sees beneath the surface of things, so it could be a message of superficial natures of some sort.
I would also see the playful side... hide and seek, Where's the GreenMan? Surprise and the element of wonder... as well as being so immersed in what you do that you become part of it. It could be feeling insignificant, as part of the landscape.
It could also be about things hidden and unknown and not being able to see the forest for the trees. That feeling that your eyes are playing tricks on you and you aren't really sure what you see... that what you are looking for is right infront of you, if you stop and really look and the differences and details.
It's a really different card for a Fool, but he does make a good case for that state of being and non being, that space where you are between worlds and yet to become one thing or another and can become anything.