Place the mirror on the long wall. Maybe with a new corner sink.

Or just hang the mirror as high as it will go.

bought as an investment

to sell or to rent?

Probably to sell….

Put mirror on wall to right of sink.

There is no NEED to have a mirror over a sink. To the right will work just fine. I would tread very lightly adding to this home, doing it right will be costly and involved being sure it's supported all the way to the basement. #1DD looked at too many homes in this genre where dormers/bathrooms were added and the houses are now caving in on themselves!!

It won't be spooky once you get rid of the dark paneling.

Talmadge St Los Feliz Craftsman · More Info

Transitional Cambridge Attic Bathroom · More Info

Attic Remodel Bath · More Info

the Cable House · More Info

To sell clean it paint it and be done. Since you do not post a floor to scale there is no way to know if a tub would even fit. Usually if getting ready to sell no major changes will get you more ROI

Perhaps a corner shower. instead of dormering to use the floor space, pull the shower in to where the head space fits. give up the two feet of floor space.