Beautiful new drawing/creative app only for the iPad, Paper by FiftyThree - FiftyThree, Inc. (Free), with an interesting model for making money: free app and then you buy the tools you want to use through in app purchases.
Each add-on sells for $1.99:
- A soft pencil/sketch tool
- Marker/outline tool
- Ink pen
- Watercolors
Or buy all of them for $7.99.
My own attempt with it reveals the reason why I hired a professional to design my logo: