I really like your style in this, it shows that you've got the ability to put in some great detail when you put your mind to it. :3 I like the concept too, it reminds me of concepts we talked about in group therapy. About how sadness can be a primary emotion for anger's secondary emotion.
I love how you choose depression and anger to opposite one another, instead of the cliche depression/happiness reflection. Because depression and anger actually go hand in hand but are still so different.