I'm really loving the aquamarine glowing down there in the right hand corner. It's amazing, and I can't accomplish that effect. And the grass is really done. ^^
The glow was done using layers and layers of aquamarine and true green and white, over and over (well, mostly the white), so that it glowed. Also, I added some blue-green tinges to the rocks and the tree, to make it feel like it was really giving off light.
And thanks for the tip (that is if I ever draw glowing mushrooms or something) ^^