Changing Texture and color can change the feeling of a painting or drawing. This drawing is done in a free app called sketchbook express which allows you to create mirror images and allows you to use a paint bucket to fill in shapes. The textures are added in a photo editing app called Snappseed. The easiest way to learn what an app can do is to play with it and experiment to see what happens. Saving your images to your photos allows you to import them between apps.