So...I worked for a couple of months for a studio named Mobiljoy and this is the art I made for one of their apps called "Madame Roulette"
This app is already available in Google Play:
https://play.google.com/store/apps/details?id=com.mobiljoy.roulette&hl=en
Character concept
The final choice
Sprites of Madame talking
Crystal ball sprite
Wax buttons
Video (App prototype)