Generate a heartwarming black and white vector pencil sketch illustration showing a large mother pig lying contentedly with her adorable piglet nestled against her in a rustic barnyard environment. The entire composition must be purely monochromatic without any color elements, using only black lines and sophisticated mark-making on white background. Create realistic pig skin texture through careful stippling and fine cross-hatching that shows the wrinkles, folds, and subtle variations in tone across their bodies, with the piglet appearing softer and smoother than the mother. Render the pigs with anatomically accurate features including expressive eyes with gentle highlights, distinctive snouts with nostril details, and rounded ears, all conveying warmth and maternal affection. Include a comprehensive background featuring a wooden barn structure with detailed planking and shadows, scattered straw on the ground created through directional line work, a rustic wooden trough or feeding station, and a wooden fence with posts in the middle distance. Add environmental richness with puddles reflecting light using careful negative space, farm tools leaning against the barn wall, and countryside elements like distant trees and rolling fields using atmospheric perspective. The foreground should feature detailed straw texture, small stones, and muddy ground with varied hatching to show different surface qualities. The artistic style should combine tender animal portraiture with authentic farm life atmosphere, executed with classical engraving sophistication and naturalist illustration precision.