Looking awesome. I'd say the only thing that looks wrong is the left mushroom. To me, your curved path is the dominant compositional piece, so everthing should support it. Right now the mushrooms are pretty much directly opposite of each other, producing a straight line in effect. Of course that may be what you want. I'd try making it smaller, add a few more, and try different placement to see what ya think. A path leading up to the ramp might look great too. Can't wait to see this one finished.