ArtFlow is an awesome Android drawing app that is suitable for both kids and adults. It comes with more than 70 brushes and tools, includes color adjustments, undo and redo buttons, andandroid drawing apps up to 16 layers with 11 different blending modes. You can import images from gallery or a camera and also export your drawings to PSD, PNG, or JPEG files. It has an intuitive and user-friendly interface. The app aims to replace your physical sketchpad and become a universal Android sketch app.