Shari
If you have too many tags then it becomes difficult for a customer o to find what they need, since the tags get listed in the drop-down under the collections.
I paint pet portraits at
https://portraits-by-nc.com/collections/dog-oil-portraitsIf you click that link, you will see ALL TAGS and once clicked the different breeds (like Poodle, Yorkie, etc) show up. If I would add a tag such as brown Poodle then Brown Poodle and Poodle would both show, which would be overkill.
Hope that helps!