The dummy image is small, but I am not sure if browsers (or wiki caching) treat the images as one instance repeated many times or many instances repeated one time (i.e., for 300 duplicated images, 1 cached image versus 300, respectively).
I think that a good multi-page strategy could be done in two ways: creating one page per setting at the top level (and adding all to a unique category or, better yet, a subcategory of [font="'courier new', courier, monospace;"][[Category:Guides]][/font]), or creating one top-level page and giving each setting a subpage. I searched the wiki using term 'screenshots' ... Terrain Bump screenshots subpage came up, and it belongs to [font="'courier new', courier, monospace;"][[Category:Mod Subpage]][/font], which belongs to [font="'courier new', courier, monospace;"][[Category:Mods]][/font], so this was a successful search for me, and it seems to be a logical way to organize mod-related screenshots. (but where the heck did the images go??).
Anyway, the ENB INI guide could use /Screenshot subpages by setting and use [font="'courier new', courier, monospace;"][[Category:Screenshots]][/font]. I think then each subpage will inherently belong to [font="'courier new', courier, monospace;"][[Category:Guides]][/font] as well
EDIT: Actually, a category hierarchy makes sense too ...
Key:
[color=#ffd700;]Category[/color][color=#ffa500;][subcat][/color][color=#ff8c00;][sub-subcat] [/color](pagename/subpagename/subsubpagename)
[*][color=#ffd700;]Guides [/color](Guide:ENB)
[*][color=#ffa500;]INI Guides[/color] (Guide:ENBSeries.INI)
[*][color=#ff8c00;]INI Settings[/color] (Guide:ENBSeries.INI/Environment)
[*][color=#ff8c00;]Screenshots [/color](Guide:ENBSeries.INI/Environment/Screenshots)
[/list][/list][/list]
the subpages are INI section names. I know these are subpages (s4n does not like them), but they are also categorized effectively, and the page names are intuitive. Searching by any term in the page name will bring that page near the top of the search result, and it is simple for users to navigate either visually or via the URL.