Pretty drawing right? Just a typical scene from Grand Central Terminal. The artwork was probably purchased from a street-vendor hustling to unsuspecting tourists. Except that isn't paint. (Well, not real paint.) The canvas is actually an iPhone and the art is from a series of finger sketches by artist Jorge Colombo using the Brushes application.
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Looks cool.
Brushes is an great app but not easy to do nice stuff like that with. That's pretty awesome.