Additional Images Layout on Product Pages - where can this be changed?

Hi - I have moved additional images on the products page to be up under product title (next to main image - by moving php call up in tpl_product_info_display.php) however images are inconsistent in their placement - they have no uniformity.

Is there a way to sort additional images by way of "sort: Left / Right or xxx Space between images? ... to group them.

As an aside: I think I will have to re-do all my images so that they are the same size and 'proportional' - at present they are set to a "width" only in admin/configuration/images but that still allows for tall / narrow images which is interfering /will interfere with a nice layout - so will work them so they have a standard "canvas" size.

BUT in the meant time can anyone please offer assistance with layout? (or even a better solution to having additional images near main image?)

cheers,
Mike