the string of code corresponding to the image on the right column is as follows: <div style="background: url(https://via.placeholder.com/374x548) cover center; height: 548px;"> .  What you're going to have to do is replace https://via.placeholder.com/374x548 with the image address of the photo you want to use.  As for the photos in the mood-board, the strings of code that correspond to each of them would be <div style="position: absolute; top: 0; bottom: 0; left: 0; right: 0; background-image: url(https://via.placeholder.com/230); background-size: cover; background-position: center; background-repeat: no-repeat;"></div> .  replace https://via.placeholder.com/230 with the image address of the photo of your choosing.  you can obtain the image address of a photo by right-clicking over the photo and choosing "copy image address".

hope this helps! ^-^