Lowery could be the creator of this ghost story within the context of a specific art form. He or she might be a relatively unknown individual who has a unique approach to storytelling. Maybe Lowery is a local artist in a small community who has crafted this spooky tale as part of their creative output in a particular art form.
We can't really tell who Lowery is just from the title 'artform lowery a ghost story'. It could be a person's name, but it might also be a pseudonym or a name given to a group or entity. It's possible that Lowery is a character within the ghost story as well, but without more context, it's all speculation.
There's not enough information given to know exactly who Lowery is. It could be an artist, a writer, or someone who has created this particular ghost story using an art form.