Works of art that express a sarcastic/edgy tone might depict characters as ridiculous, perhaps caricatured and shown behaving stupidly or reprehensibly. Beyond representation, art elements such as odd shapes, splotches of strong color, and/or crude paint application might contribute to a sarcastic/edgy feeling.
An artist might impart a sarcastic/edgy tone to a piece due to his or her own edgy emotional state, or the artist might choose to evoke this tone as a reflection of the character(s) or scene being portrayed. A sarcastic/edgy tone might also be adopted to suit a piece that will be shown in a setting that demands an expression of ridicule.
Featured: The Plumb-pudding in Danger by James Gillray.