Contact a moderator to edit the original post. Meantime, just announce the price reduction in a reply to your own post.
The forum software is apparently unable to read orientation data on pictures taken with newer mobile devices. Simplest solution is to take all pictures in standard orientation (landscape mode, home button on right). You should be able to crop them down if needed without changing the orientation.
The moderators may be able to fix the pictures you have already posted if they have time. They are really helpful, but they are volunteers with day jobs and campers like the rest of us!
Best wishes on your sale!