Image position under menu

I am not able to move the image (which I made sticky) closer to the bottom line of the menu. I think it is possible because I have seen it on other “forever” sites. Here https://jgburdette.wordpress.com/ & https://complexgeometry.com/ But they are both using the image as a slider which I have not been able to work out.

The site where I want the image closer to the bottom line of the menu is https://noahsart.com.au/

I am really bad at code but when I know where and what to change I can manage it.