How to incorporate third person scenes into a first person story

I tried it for this Pink Orchids story.

Katherine's Earthly Delights

My reasoning was that most of the story is Katherine's fantasy set in 1902. Then at the end, I switch to describing where she really was when having the fantasy and a bit about what inspired her. I did give the readers notice in the first couple of paragraphs about what I was going to do. It's not something I would try very often, but I guess it worked in this case.
 
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