You can start using Sketch in three different ways: take a photo right then and edit it, load an image from your device's memory, or start with a blank canvas. If you choose the last one you'll be able to use your fingertips to start drawing with any of the many tools available on the app.
If you choose the first or second option you'll be able to edit the picture with the sticker-insertion tool. You can add lots of funny elements to your image: fake mustaches, beards, hats, sunglasses, and more. There are more than twenty stickers available by default, but you can also download many more.
Once you've finished working with your photo, you just have to save the result to your portfolio, where you'll be able to go back and access your previous work at any time.
Sketch is a brilliant photo-editing tool with many interesting features. Luckily, this excellent app is already included on most Sony devices by default.
Requires Android 4.2 or higher