PhatPad for iPad - More than another note-taking app, PhatPad turns your iPad into an advanced brainstorming tool. Draw, write, and type your ideas then instantly share them via email, WiFi sync, Dropbox, or presentation mode
Procreate - Procreate turns your iPad into a fully-fledged sketchbook. Packed with a wide range of professional brushes and an advanced layering system, the app lets you create true works of art in no time.
Procreate is powered by the high-performance OpenGL ES 2.0 painting engine, Silica
SketchTime - If you love sketching and taking notes anytime anywhere, SketchTime is the best choice. SketchTime is super simple, easy, quick, and reliable. Most of all, it's so smooth, fast, and responsive even on the iPhone3GS, iPad1, iTouch3. Moreover, it's an inexpensive and universal app.
There are plenty of painting and note taking apps out there
Autodesk SketchBook Express for iPad is a fun and intuitive drawing application. Get a taste of the SketchBook Pro experience with SketchBook Express.
Use professional-grade tools and brushes to create doodles, quick sketches or artwork on-the-go
LINE Brush for iPhone/iPad - LINE Brush is an easy-to-use drawing tool for iPhone, iPad and iPod touch.
The app allows you to draw on photos or create new sketches from scratch using an assortment of brushes, pens and crayons.
When you have finished, you can quickly share your creations with your LINE friends