'nogi_akira' and 'toukatoukatouka' each link to the artists' personal and professional art accounts, respectively. The oldest post tagged 'nogi_akira' is 4 years old while the oldest post tagged 'toukatoukatouka' is 2 years old, and the personal twitter account also predates the professional one by over four years. The seniority of the tag in addition to nogi_akira being less obnoxious to type out makes me think it should be the main tag but, I mostly would just like to get all the art under one artist tag.
Updated by kittey