Wow! You're posing practice just keeps surprising me! What wonderfully relaxed pose, and it's not with it's air of sensuality either. ;3 What I'd say to work on for this pose specifically is her breasts. Everything else looks positively perfect, but he breasts seem a little too perfectly rounded and bunches together normally for a pose that has her breasts being pulled to the side (by gravity I mean, heh). Here, if you don't mind the link, this is comparatively similar nude, large woman from a nude models site, I've looked at a bit from time to time for my own reference.

http://www.bodyscape.net.nz/images/drawings/nudes/Nude%20drawing%20-%20Virginia%20lounging%20-%20duhamel.jpg

That's what I mean by needing to show some more of the weight or gravity of your Nido-gal's breasts. I know they're not the same set of breasts either, of course not, but just saying a more natural look for them, no matter how big nor small, saggy or perky, if there's some visible weight shown in a lounging pose like this one, I think it really brings the rest of her body together. Makes it all more harmonious. Hm hm. ^^