One of the common mistakes people make when hanging pictures or art work is hanging it too high. You'll read a lot of advice that says to hang your pictures at "eye level" but eye level for one person can be totally different than eye level for another person. Take for example Shaq and Jimmy Fallon. . .you get my drift?
Although, there is no hard and fast rule on high or low to hang your images due to space considerations such as the height of ceilings, there are some general measurements that can guide you in the right direction.
Generally, you'll want to hang your art or pictures 57-66 inches from the ground to the midpoint of the frame. I know, that's a difference of 9 inches! A lot of art galleries use the 57 inch mark, but you may want to experiment to see what works best for your hallway.
For the sake of ease, let's say that you're going to hang your pictures in a single line down your hallway. Don't feel bad about doing this. You don't have to have a fancy photo arrangement or gallery wall to make your hallway impactful or pretty.
With your tape measure, measure to where you think you might like the mid point of the frame to be in your wall and mark it with a pencil. You can either eye or measure your frame to find the midpoint. I would go ahead and nail one picture into the wall to see how I like it.
View the picture straight on and also from each end of the hallway to see if it looks right to you. Ultimately, this is your house and it needs to look pleasing to you. If the height needs to be adjusted, don't be afraid to take it down and nail another hole. Your frame will more than likely cover the first one and if not, it's an easy touch up. A couple of holes in the wall is worth your pictures being hung at their best height since you'll be looking at them every day.
One last tip, if you are hanging just a single line of pictures down your hallway, err on the side of larger frames to keep your hallway from looking rinky dink. I would probably go with 11x14 or larger or 12x12 squares at the smallest. If you don't want to print your images that large, Ikea offers some great matted frame options at an affordable price that give and space and image a polished look.