Just as a general comment on artists, please don't anyone be shy about adding qualifiers to artists, such as pixiv url account name or homepage name.
In fact, for any single name artist using an even remotely reasonable combination of Japanese syllables I would recommend this as a general rule, even if there is no present clash. So for example if "rinoko" is used, go ahead and qualify it. Even if there is no rinoko currently.
The reason is that if we don't qualify right off the bat, we will undoubtedly run into a conflict eventually, and then I'll have the unpleasant choice between 1) aliasing a single name to something more specific, or 2) only mass editing it, orphaning the old tag and everyone's subscriptions and RSS feeds and such with it.