Your students all look intent and caught up in what they are doing – always a good sign!
For adding photos here, look at the icons in the bar above the text you are entering. The very last on the right shows a mountain with a dot (probably supposed to be the moon). If you click on that a window opens that allows you to browse your phone/laptop/etc. and find the photo you want to add.
You do need to put some text between each photo, even if just an ‘x’. At least it used to be that way. I haven’t tried in a while.