Human mood by colors

I created this picture with name " Human mood ". First of all, I wanted to create 4 faces with others mood ( fun, cry, angry, sad ), but I found that, my picture did not describe all of my idea. I came up again with slide. I found the value also create the mood. I tried up with other colors and found the best colors for my work.

In the picture : I change the color form green to black, but three main colors in my picture are : green, red and black. It's also create 3 different mod of human : happy, stress and extremely despair ( want to be died ).