I am not an expert in the technical aspects of woodblock print technics, but I know that first, the Japanese used natural (vegetal) dyes, until they began importing aniline dyes from Germany. It's fairly easy to recognize printings made with the latter as the colors tend to be more vibrant; however, they also tended to "run" a lot, especially the reds: it's an issue that wooblock prints collectors encounter a lot with prints from the 1860s to the beginning of the 20th century circa - after that the dyes used are of better quality. Also, the Ebina series typically use mica to enhance some of the spaces and details

There are 54 prints in the Ebina series, one print for each chapter of the "Tale of Genji". It's the usual number in most series reflecting this book

I am not familiar with resources on the "Tale of Genji" online and in English. Overall I would first recommend to read the book itself. There are three translations available: I use for the Ebina series the one by Arthur Waley, which dates back to the earlier decades of the 20th century and is now pretty difficult to find in its unabridged version. The following one was by Seidenstricker, which is maybe more accurate in terms of translation, but is less pleasant to read and I think lacks the poetry of the original text. A very recent translation has been done by Royall Tyler, which is supposed to be the best of both worlds; I tend to think it's more of a compromise: it's a very valid translation nonetheless