Here are some examples of displays.  

This dealer sells Friendly Folks and personalized book (on the left).  Notice how many pictures are on display. The only thing you can't see here are the bins.  This is an example of a nice display.

Our classic mall display.  Framed pictures on each side.  Good lighting and sample bins on every side of the cart.  These are the elements of a good display.

Here is a nice display used at an outdoor street fair.  This dealer used a generator to power their computer and printer.  Notice the nice selection of framed pictures and bins.  Also, a nice display for magnets and key chains.

Close up of bins and keychain display.  Notice the lights and the "Personalized for FREE" sign on the bin.

Here's a nice way to display a lot of pictures.  Just make sure they're hanging straight.

Here's the side of a cart at a mall.  Look at some obvious problems.  Only 9 pictures on display!  That's not enough.  Also, where are the pictures in the front of the bin? 

Look at these two pictures.  What's missing?  Display bins, of course!  Don't re-invent the wheel.  Stick to what works.

Here's a nice display.  Pictures all around (even the top), nice lighting and display bins on every side.  I would, however, move the cash register and computer to the side.  This way the customer can browse without feeling like someone's watching them.

Here is a separate floor display designed to hold additional framed pictures.

Here is a nice floor display for the kid's t-shirts.

These are other display's at trade shows.  Notice each one holds at least 20 pictures, has a bin and uses lights?