mysterious tribal assassin full-body concept art, crouching with an ivory knife, hood, simple wooden mask with black eyes, wood texture, torn fabric, tattered clothes, green and black tones, black tones, dark tones, subtle tribal features, jubgle background, rim lighting, 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, subtle lighting))