Create a detailed illustration of a woman petting a cat on the porch of a seaside cabin. The scene should include the woman sitting on a wooden porch, gently stroking a relaxed cat that is sitting beside her. The porch should have elements like a wooden railing, a few potted plants, and perhaps a comfortable chair or hammock. In the background, depict a serene beach with gentle waves, some seashells, and a few scattered rocks. The sky should be clear with minimal clouds, emphasizing the peaceful coastal setting. The overall style should be realistic yet tranquil, capturing the warm and calming essence of a seaside cabin. The image should be suitable for coloring, with clear outlines and defined spaces.