I am selling art.

On one page, let's say the "Abstract" page, I have items which are horizontal, others vertical. On the page itself, I choose the square format for the pictures layout.  But when the person clicks on an item to open it, I would like it to show the whole picture of the item, which is possible.  Except that that all the items on the same page will open the same way: either horizontal or vertical: I cannot find how to have some items open horizontally and others vertically.  Any solutions?

If I cannot display my art pieces accurately, this is a problem.