TV Series: Merchandising

So I am in the process of creating a sculpted scene including three main characters and a group of enemies attacking them, ive recently just got another piece of polystyrene which is larger than the one in the image above, I have used a heated sculpting knife to create a hill/mountain landscape for my scene, I am very pleased with how these sculpts turned out, the characters are in good poses and have some great detail, I wonder will I paint them, the last three sculpts were painted but I feel that the paint ruined them a little bit.