>>28613
> Sorry for being off-topic, but I find the section of neck (or limbs) is always like a hollow trunk in many AI videos. Is there a way to improve it?

Actually I consider this on topic, or at least close enough, because I'd like to see people making an effort to get better results than mere prompt writing provides.

I experimented with a similar idea in this thread: https://boards.guro.st/ai/koko.php?res=24383&page=1

If you can find a decently realistic cross section of a neck, you can try providing that as a reference image in a reference-to-video workflow as see how much that helps.