SFGate

Cynthia Taylor-Luce Hang a series of pictures in a row, so the middle of the pictures are at your eye level. Then they will be a pleasant thing to view as you walk through this space.

pipeman1 This blog link (I do not know her personally) has a great idea for your space, http://www.girlinair.com/2012/04/how-to-make-giant-photo-booth-style.html

Kelly I like large prints intermixed with some smaller and put the pictures as low as you want. The trick is using frames that are similar in style as opposed to all different. The chair rail makes it a little harder to place them- would you consider painting the lower half of the wall? A think a soft gray would be gorgeous. Or better yet white wainscotting? This would balance out the pics above. Benjamin Moore Dried Basil, it has a touch of green is great color. Lastly, a hanging light/chandelier would be amazing!

Kelly light fixture

Dytecture I would divide the hallway into sections and repeat the decor so there is a rhythm happening.