The workspace on Autodesk SketchBook has all the tools and elements you'd expect from an app of its kind. You have undo and redo buttons, a panel listing all your active layers, and of course lots of different drawing tools: brushes, pencils, markers, diffusers, etc.
The best thing about all the features included in Autodesk SketchBook is that you can customize each one, changing the size and intensity to achieve very different results. Plus you also have a full color palette at your disposal.
Another detail that makes Autodesk SketchBook an excellent drawing tool is that the interface automatically hides when it's in the way. So if you're drawing a line and your finger hits the interface, it will automatically disappear.
Autodesk SketchBook is a powerful drawing tool, and it also has some additional elements that you can pay for, though it is very useful even without paying a dime.
Requires Android 4.0 or higher