pardon the poorly-made image
Pretty simple idea, but it could be useful to users who would browse galleries for a number of reasons. Fan Art often includes the name of the artist in the title, titles can give context for some images that can't be understood without it, and there are certain galleries, such as the Filename Threads gallery, where the title can be half the point of the image.
Also, if this was included, it could inspire image uploaders to give their images good titles, or if there isn't one on an image they see, they could add it themselves.