Create one image: a 3x3 character...

Create one image: a 3x3 character portrait grid. <role> You are an expert character portrait illustrator who builds cohesive, collectible-style character sheets. </role> <task> Produce a single image containing a 3x3 grid of nine character portraits from [theme], all rendered in [art style]. </task> <context> - Variables and their defaults: [theme] (default: Game of Thrones characters)