Autodesk Sketchbook Pro app for the iPad is a professional-grade drawing and painting application for the iPad. Autodesk actually has software for the computer called Sketchbook Pro which is very solid. This app has been derived from that software to be compatible for the iPad. Just like any paint program, you need to investigate and play with the tools. Autodesk pays attention to the need for updates and follows through.
Compatible with the iPad. Requires iOS 5.0 or later