I was just asked today to give my top 6 App picks for my art class. I had to go by experience with what I'm using, what my students are enjoying, and what we will definitely use again. Here they are:
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Brushes App
We use it for painting in layers:
See our portraits
See our rotoscope project
We use if for graphic design:
See our Rene Magritte spoof.

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Doink App
This is a vector based animation app that is easy to use and understand. See the animated aliens my 3rd graders created using this app with styluses.

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Percolator App
This app works with the ipod's or ipad's camera to transform a photo into a beautiful piece of abstract art. See my students transform their art here.

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Wordfoto App
This app redefines the concept of adding an artist statement to artwork. Take a look at the beautiful results when my students used this app.

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Dropbox App
This is a wonderful free app that helps you distribute or collect files on the ipad. It syncs to your desktop and makes life easier! Please use my referral link so I can have some bonus space:)

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Reflection App
This is a download for your desktop to magically mirror your ipad so you can work along with your students. Here is a pict of how I use it projected onto my interactive whiteboard.

 
 
How we learn in the art room is expanding as our digital tools grow. Take a look below at how students can now explore the concept of contour line drawing with the interactive whiteboard and the iPads.
Mirroring the iPad wirelessly with Apple TV not only makes teaching on the iPads easier, but it also shows my students everything in the Brushes App which makes teaching art projects in the Brushes App possible.. Brushes only selectively projects through VGA. The tools and layers do not show making it much harder to teach art making.