/ic/ - Artwork/Critique

Alright lads, I'm requesting help on behest of my friend.

The first image is his work thus far. He's been told that the arm isn't connected properly to the body and looks janky in some places.

The second image is me trying to convey how to properly attach the arm in the position he drew it, as well as trying to show him how breasts are affected by gravity as well as (poorly) attempting to tackle some perspective issues.

The third image is him trying to construct the body and his thoughts on how he intended it to look, as well ass adjusting the breasts to incorporate weight to them.

I'm afraid I'm not fully capable of addressing some of the issues in this image, and I'm wondering if any of you here can help with your own input on how to correctly portray this pose.