i came across THIS on flickr, and instantly fell in love...and then when i saw it was made on an ipad i FLIPPED!
I asked the artist, Luciano Lozano, what app was used, and he led me to Brushes and suggested i check out David Hockney's ipad art. I highly suggest a google, it's really inspiring.
I can't wait to try more! This is one of my first attempts playing around with it!