A simple node set up to create a decent leaf material includes three packed leaf textures.
Great work! If you want to make your leafs a litle more realistic, try to figure out how to make them transparent, that would be soo cool!
I was playing with that and I could not get a decent balance and when I rendered I could see the leaves below through the top leaves and it looked messy so squashed the transparent shader. I will do little more detailed research thanks for the heads up.
Yes, its not easy, I had the same problem. If I have more time, I search for a solution :D
Very nice leaf materials. Thank you!