The software formally costing ~$800 is now free to use on Android devices.
Press announcement on cartoonbrew.com
Besides it's great animation tools, TV Paint has a complete set of illustration tools and brushes that, much like Clip Studio Pro, can be use to create full illustrations.
Here is an example of simply painting on Android
It is the same software as the desktop version. Originally optimized for use on the Wacom Companion Hybrid and sold as an optional bundle in Europe. Artists and animators can download the installer directly from TV Paint Development. It is fully supported on Samsung tablets that are sPen compatible.