You could try the transmission (cheap) or the real SSS in the material editor to make some of the light go through the leaves and appear on the other side.
On the face, i am repainting that, as the colours are not coming through as intended , and want to work on some sss. Just need to read up some more on that
Nitrous improvement. Viewport Canvas improvement: same viewport feedback like Mudbox, to see Specular, Gloss, and etc. Maps. A Good SSS Shader for IRay.