The blog is not in English, but no language necessary for hanging pictures with these great examples!
A link to lots of ideas to hang pictures on walls..for the hallway unless decide to do wall decals
Clever Ways to Decorate Your Hallway • Picture Frames lining stair way would be elegant.
I could wake up and walk down a staircase display like this every day.
Photo by @veronica_lea
This looks a bit like school, but we love the idea of a picture so you know whose hook is whose
Great Idea for photos in a long hallway - Notes From Nessa : DIY Picture Ledges
a great page to look at if you are struggling with how to hang pictures on your staircase.
Antique and vintage touches make this hallway gallery wall a true gem. Eames chairs and an entryway bench add more.
Cute with your kids pictures and I like the wall, it won't scuff like paint. Be cute for your mid room entrance.