Create an image of a Nac Mac Feegle from Terry Pratchett's Discworld series, styled to resemble the illustrations by Paul Kidby. The character should have the distinctive look as depicted in Kidby's work: a small, blue-skinned figure with fiery red hair that is wild and untamed. The Nac Mac Feegle should be muscular and wiry, with a mischievous, fierce expression, featuring large, expressive eyes and a broad, toothy grin. Dress them only in a tattered tartan kilt, as they do not wear any other clothing, and have them wield a small, crude sword or dagger. The art should capture the detailed, realistic yet slightly whimsical style of Paul Kidby, with fine line work, rich textures, and careful attention to character design. The background should evoke the Scottish Highlands, with misty hills, rocks, and elements of nature, reflecting the Feegle's connection to the wild.