Blank space in header (and different headers)

Thank you! :) I'll come back to this when I'm done with everything else. I need to go through all my pages because there is a lot of old HTML in the texts that I want to delete. In the process, I'll figure out a solution for the images and see if that can be solved by the <figure> element :)
Thanks again for your kind help!

You're welcome.
Feel free to raise any new topics :)