I painted the whole face for both of them on a separate file. This is just a composition that I thought about. One of them is upside down to show how different they are from each other. Elsa is cold and always tries to be in control while Ana is warm and free-spirited.

The color of the background behind them emphasizes their differences.

Also I only show half of their faces to illustrate that no matter how different they are, they are still not complete without each other.

Thanks for your rating and your questions :)