I'm not sure specifically as I haven't read the 'wetlands novel'. But it could have a local fisherman as a main character. He might be someone who has a deep connection to the wetlands and depends on it for his livelihood.
One possible main theme could be environmental conservation. Since it's a 'wetlands novel', it might focus on the importance of wetlands and the need to protect them.
A cartoon doctor girl might have a cute and friendly appearance. She could be wearing a white coat and carrying a medical bag. Her expressions might show kindness and determination to help others.