might want to vary the colors of the grass blades to create some depth.. same with the leaves.. more layers of different colors will give it more depth (slightly bluring the ones toward the back will help as well.. good luck

yeah i agree with golem, the grass does need to look more varied and you might want to make the overall picture more realistic, try the burn tool its very helpful for tiny shadows good work!

I agree with golem aura, they look too painted on. I'd also change the name to something a little more creative than blue cow_4a75bb2885ac3. Good luck!

i am new at this so i will not give any smart comments... i like the idea... little work needed...