Saying this is second party source is not quite true.
Back in 2017, Arty did have Moegan Photography publish her photos for a while.
They were the photoghrapher, editor and publisher to her cosplays.

Don't know what their relationships are now though.

And damn, I miss Arty's photos in the old days. lol
She went with showing her assets a little (and I mean a lot) too much these days.