Sorry for delayed response (is there any way to set up email alerts for new responses other than having RSS then remembering to check Google reader?)
I since moved some of the pages around, hence the 404 to Details.
What you say above is what I understood already and makes sense - the issue was that I did have 4 sub-pages and all of them would always automatically default to the last uploaded individual image, i.e. when trying to upload unique images to those 4 sub-pages, for instance, when uploading the 2nd individual image, the 1st subpage would default to the last uploaded image which was only meant for the 2nd page, and so on. However, since moving pages around and changing the templates the problem has been resolved. I now have no more than 2 sub-pages.
Aside from this, a follow up question is this:
On this page: http://184.108.40.206/~photos/gratitude/ I have the flexible grid gallery option to be able to get the full width page, but, I also only want the image to be displayed on the background but this would then mean a different option. How can I get the image to only show on the background but keep the full width but get rid of the smaller image on the same page at the bottom left?