Thank you all for the comments! Glad people seem to like the idea
I've been thinking a little more about the relationship between Atlas and Palinor as I was sketching. Here's a quick update with a new sketch of Atlas. I figured that Atlas probably wouldn't be able to hold his staffs, so maybe they would have bound his feet(hands) to each of them. I also thought about the idea of feeding, and liked the image of Palinor fishing for tuna or crab as Atlas moved slowly through the ocean. In this image, we can just see Palinor offering a small morsel of food towards Atlas with his rod.
I do like that idea but also like the possibility of sculpting some mean claws!
"The amphibious turtles normally have limbs similar to those of tortoises except that the feet are webbed and often have long claws."
That might be a nice detail. I'll see how it goes. Perhaps one could be bound due to injury and the other free to hold the staff. I suppose these are minor details but it's always fun to have a good think about whatifs when looking at creatures & critters!
Anyways, here's the latest sketch:
Comments/crits always appreciated

Oh I should mention the jetty, boy is just to give a sense of scale, and may come into play for my final base. I like the idea of atlas finally stepping onto land with water dripping off his back leg. Finally perhaps he can have a rest and strip himself of Palinor's house?