In 2005 David Hockney left Hollywood, where he had lived full time since 1978, to transform the manicured slopes, woods and farmland of the East Yorkshire landscape into spare, quickly worked compositions charged with pink, orange and violet. In the next two weeks 28 of these paintings will go on view in New York in a two-gallery exhibition at PaceWildenstein, both in Midtown and in Chelsea, through Dec. 24. Hockney also experimented with Photoshop to create vibrant portraits...