Interesting way of presenting in a single image the changes of the states of mind; like no frontiers.
The employed colors do not make it so depressing.
In order to present mixed the faces more than 3 faces separately
In general I like your style, and in this case it was applicable much more for the susceptibility of the changes.
Transparencies reinforce the idea: The changes of state can be subtle.
Enough visual force to attract the look, the semi-rounded shape helps to hold a constant journey for the whole image.
Make it vertical