What I gathered from reading and watching is that you can turn people off when you close up by crossing your arms over your body and crossing your legs. You are crunching up to take up a smaller amount of space. Buyers reject this kind of posture. At least, according to what I gathered from watching the video and reading the article. They relate more to the person with an open stance who takes up more space.
The person who stands with hands on hips has a more inviting posture. That one surprised me because it might appear to others that person wants to dominate. I don't know. However, I often find myself in that pose just because it seems more comfortable. I'm not trying to dominate. At least, not consciously.
Message for authors and for artists: Open up. Be sincere. Invite conversation.
What do you think?