Create a highly detailed and realistic image of a miniature long-haired dachshund with a rich fawn and charcoal coat. The dog should be portrayed in a serene outdoor setting, lounging gracefully on a lush green lawn with dapples of sunlight filtering through overhead tree branches. Its expressive eyes should reflect a gentle and curious demeanor, and its long, silky fur should show distinct shades of fawn mixed with darker charcoal highlights, especially around the ears and tail. Include soft focus in the background with a few colorful wildflowers and butterflies to enhance the peaceful and idyllic atmosphere. The overall image should capture the unique charm and elegance of this specific dachshund variety --niji 6