The two journals listed below are both specific to the topic of Ukiyo-e. The first is in English, the second is in Japanese. Take a look!
The following databases provide access to journal articles from many disciplines. I recommend trying out these databases first by conducting a quick search on "Ukiyo-e" ("Ukiyoe") or "Japanese printmaking." See what comes up and then change your search tactics accordingly.
Use the following sources if you want historical background on any given topic.
If you need high quality images for your papers, be sure to cite where you took your image from. Some reputable places to do so are the following databases, indexes, and reputable websites: