I'm writing a book with a blending of first and third person, and it switches whenever I need it to and not across chapters. The third person follows every character until the perspective changes to the first-person narrator, who then starts narrating until it switches again.
For instance, here is an example of both of them together:
I then proceed to hand him some supplies, which he sets on the island, prepping our work to make the delicious breakfast. Meanwhile, I listen to the conversations at the dining room table. Samuel starts first, sitting straight up in his chair. "How'd y'all sleep?"
However, I have a moment where the first-person narrator is asleep, and the third person references the narrator.
He walks across the living room and into his father's [the narrator's] art room. But he realizes his father isn't there.
So, would it make the most sense to reference the narrator in third person like above or to have the narrator say "My art room"?
The first-person narrator is not omnipresent or omniscient, but when he narrates, he normally speaks in present or past tense, as if he's in the future, telling the readers about the past. So, he knows a good amount about what's happening or going to happen.
Here is another example:
Across the world, as far away as they could get, are two others that morning. Their presences were unbeknownst to me at the time, but they are well. Maybe well isn't the right word.