I can't find his artist tag. Was his art removed or i just didn't notice that they weren't uploaded here?

It seems as though guardian-hawk isn't an artist, but is a commissioner instead. Unless they've actually drawn art, in which case none of it has been uploaded on this site. I checked with guardian-hawk status:any to see if there was any deleted artwork, but there wasn't.

In any case, there's no DNP status for them.

Some ways to find their art.

• adhara
• https://e621.net/posts?tags=source%3A*guardian-hawk*

There's no good way to find art from commissioners.