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Try to get a blade underneath the white mirror adhesive and slice it off, then clean it with spirits or whatever takes it off (I would start with everbuild wonder wipes). If you've done all that quite carefully you should end up with a paintable surface.
First choice from my toolbox would be a 6" t bar scraper.
https://www.screwfix.com/p/no-nonsense-long-handled-scraper-6/87299
Airhead
Dramatic_Hammer
There are 3 layers of plaster (brown, white, pink), then paint and then some white glue/sealant on top which is what pulled the layers off when I removed (smashed) the mirror that was previously there.
I was planning to scrape off the remaining sealant (top left), remove any loose pieces and the top pink plaster ‘islands’ in the middle, then have a go with that ready mix plaster @andos suggested. Turns out I have a big square trowel I’d forgotten about.
It doesn’t need to be perfect as we’ll put another mirror in afterwards but probably not a round one so I can’t just ignore it!