You're dead on with the inflection, incredible likeness.  You're probably classically trained I bet .

GOLDWING by Billie Eilish slowed.

All credit goes to Billie Eilish

GOLDWING - Billie Eilish (slowed + reverb)

Billie Eilish - Halley’s Comet [slowed+reverb]

Hi! I love music, and creating it. You can listen if you'd like :)
Enjoy <3