Bill-Splitting App - Tax & Tips

Sneak peek of my side project with @edwintoh and also my first experiment with flat design. Essentially, it's an app which helps solve the ever-dreaded post-meal task : splitting bills amongst diners.

This screen is done to calculate the amount of tax and tips. Icons above the slider will change according to which direction the slider moves to. E.g : bigger tips means bigger smile on the waiter's face, etc.

Feedback for this would be greatly appreciated! :)