A captivating full-body portrait of a devout Sister of Battle stands majestically in front of an intricate stained glass window, her face detailed and symmetrical, with reflective eyes, dark eyebrows, and artful makeup. She wears a unique blend of sci-fi nun armor, exuding both strength and grace, reminiscent of the Warhammer 40k universe. The setting is a grand hall with marble walls, illuminated by detailed, dramatic lighting, including rim lighting and chiaroscuro effects that add depth and drama. This scene is painted in a professional and majestic impressionist style, inspired by masters like Waterhouse, John Constable, and contemporary artists like Atey Ghailan, Greg Manchess, and Jeremy Mann. The artwork captures the essence of these influences, trending on ArtStation and CGSociety, featuring intricate and high-detail elements, with a hint of the fantastical style of Studio Ghibli and the atmospheric beauty of Makoto Shinkai's Kyoto. The composition is enhanced by dust particles floating in the light, creating a sense of motion and life in the timeless setting.