Digital Art for Ipad 2

So, after searching, I came up dry....anything for us digital artists?  I have Artrage and a few others that do auto changes, but a nice Cloning tool like in Painter would be so great.  I love to sit with my tablet on my lap and doodle with a photo but just can't find an app that works like Corel or even the Mixer Brush in PS?

Any ideas?

Thanks all.

deb