Improving last semester's project

After unsuccessfully simulating jade's appereance last semester, i try to improve my codes now.
Here's the current result:
















I will try to improve my formula to create a better one as i am also working to implement multi-layered subsurface scattering for translucent materials.
I will try my best to match the results from original paper's authors. The images below were linked from http://graphics.ucsd.edu/papers/layered/