Here are some images from his current rigging. I have focused mainly on his head and arms at this point. So for now he can’t swim. He now has FK and IK hands with the ability to blend between them.
This would be more like a pose where he was coming up for air. His mouth is also closed.
A little happy pose, he has a slight head twist he picked up from my dog Leeloo when she is concentrating hard and trying to figure out what you are saying.