It seems (to me at least) that the "art" and "pictures" labels are redundant. Also, I wonder if even "symbols-symbology" should also be absorbed, as well as terms such as "icon", "iconography", "depictions", etc.
There are a couple of questions about sculptures under art but none about dynamic art-forms, such as music or theater. I think that pictures should be synonimized into a new tag -
images, which semantically includes both two-and three-dimensional images, and that this new tag should be applied to all of the questions currently bearing art instead of it, since the word "art" can refer to all kinds of stuff not related to images.
symbols-symbology, on the other hand, refers to all kinds of symbols, including purely conceptual ones. Some symbols are images and vice-versa, but these are different concepts. I think the tags should be distinct.