Yes, through FTP, but the file names still needs to be changed in the query you've posted.
If this method is easier for you, it's great. However, you forgot about other things 4images does when new images added: when you add images using 4images itself, it not only adds information about the images, it also generates search keywords, and maybe some other stuff, such as updates statistics. Just for the sake of an experiment try search via 4images search the images you've added using only MySQL query, I bet it won't find any.
So, in case you missed it some how, we have a
guide for another method adding images via FTP, witch obviously is most preferable for majority of 4images users, it's more protected from human errors, with 100% proof from messing up the database.
Anyway, thank you for sharing with the community. Maybe someone find your method useful.