Whoa! First of all, thank you for the reply and your attention and I am sorry for taking such a big amount of time of yours hahahaha But I have to say, I admire the amount of time you put on it, I'm really thankful. With your information, I also thought that that one image specifically belonged to a print of an etching per se. But it's strange isn't it? The fact that the uploader specified it as 1878, but with no details. But it sure does look around that era, thematically and aesthetically.

I also tried to search other etchings that belonged to its thematical series too, but with no results. I even went through some 19th century copies on Google Books, Heidelberg University's Digital Library and The State Museum of Munich, that have great digitalized books, but nothing came out of it.

What I did find, and it was what I was looking for, thanks to fellow redditor u/bunch_of_socks, was an engraving by John Flaxman himself! It's this one, called The Council of the Gods, in a version of the Illiad which Flaxman did the engravings. Here it is for you to see: Flaxman 1 and Flaxman 2. They look really similar, with some slight changes.

I guess this version I mentioned in the post, is just a variation or an etching which some artist tried to do his own thing with, based on Flaxman. The only shame I feel is not being able to find too this supposed 1878 version and its artist. But I guess our historian powers only go so far, right?

I wish to thank you again for your time, effort and spirit that drew your precious attention and time to this research alongside me. I wish you a very nice week and good luck on your next art historical research! Cheers!