male teenager space marine concept art, no helmet, very short hair, realistic very short messy tousled hairstyle, heavy white scifi armor, coat skirt, serious expression, green and white tones, black tones, dark tones, subtle scifi features, battlefield background, deep shadows, ((graphic novel sketch, black sketch lines, low-key cinematic lighting, thick ink outlines, digital oil painting, posterized, cel shading, vector illustration, tenebrism, bold brush strokes, subtle colors)), holding bolter