We used Sketchbook Express which is a free art making app. I find it very easy to learn and navigate so this is why I chose to teach with it. We do have the Brushes app. I know a lot of iPad art classrooms use this app, but I haven't found it as fast to understand so I didn't use it this time.
I began by introducing what a still life is and what are contour lines. I then had each student take one shoe off and place it on the table. I asked the class to look for different types of lines on their shoe. Each student then took a photo of their shoe and uploaded it to the Sketchbook Express app.
We then added a second "layer" on top our photo and used one drawing tool to "trace" the contour lines of our shoe. I encouraged the class to hide their photo layer to see how they were doing. During the second day they were more comfortable with the app so many tried different line widths and blew up their photo to get more details in their drawing.
During the third and final class we uploaded our drawings to Dropbox. To close the last class out I gave each student some manila paper to draw their shoe with pencil. I saw a second grade class that was comfortable drawing their shoe from observation after using the iPads.
I think this was a successful first iPad lesson. I hope you think so too. I was very surprised with how quickly most students picked up using the app and how much fun they had exploring it during the second class.