I took a quick peek at your article, its a nice own, especially this time of the year, eh?
Anywho, I did have a few things that may be useful suggestions. For your pictures, the books throughout, there is a way to connect those with amazon or some other affiliate service, right? Like so that a visitor could click on them out to buy 'em? Might be something to use.
Also, not sure if it was something you were planning on or not, but "Elements of Human Fear" & "Machinery of Gothic Novels" looked like they could be future niche articles, and maybe add to your collection of gothic novels/horror.
Hope that I helped, it was a good read : )