First artwork with multiple characters! What are they arguing about?..

Made a big progress on learning anatomy, still practicing perspective.
In the meantime decided to draw better faces and I think it is a step forward from my previous artwork.
There's a problem with coloring, however. I'm not sure how to feel about my color picks. Skin is mostly fine, but I dislike Celestia's mane and don't know how to make it look better.
Would really love to hear feedback on this one!