A striking full-body portrait of a devout Sister of Battle, poised in an action scene, stands gracefully before a magnificent stained glass window. The sister, a beautiful and fierce warrior, is clad in intricate sci-fi nun armor, reminiscent of the Warhammer 40k style. Her symmetrical face is detailed, with reflective eyes, dark eyebrows, and subtle makeup enhancing her features. The setting boasts marble walls, with dust particles visible in the detailed and dramatic chiaroscuro lighting that casts a rim light from above. This scene is rendered with the style of a majestic impressionism oil painting, drawing inspiration from artists like Waterhouse, John Constable, Jeremy Mann, and Greg Manchess, while incorporating elements of Studio Ghibli and Makoto Shinkai. The artwork, rich in detail and intricacy, would be trending on platforms like ArtStation and CGSociety, capturing a dramatic and high-detail aesthetic.