I've currently resolved the three bad artist tags doctor, blade, and rabid to Ren Myler, Rae Naomi Turner ,and rabid (artist) respectively.

I don't know how to actually fix the problem of these three tags still showing up as artists even though they clearly represent something generic in most pictures.

However, I must beg THINK BEFORE YOU CREATING NEW ARTIST TAGS.

Yeah, I had this problem with 'irony' tag and a few others.
I think you have to append 'general:' in front of it.

You can edit tag and add something like

general:doctor

and press save.

Science!

Jazz said:
You can edit tag and add something like

general:doctor

and press save.

Science!

Thanks. Still doesn't excuse the bad tagging XD.