lighting

See pictures. Bathroom fixture next to the mirror. I'm not sure how to open the cover to replace the bulb. Any suggestion is much appreciated!

I have a home that was built in the late eighties - I've lived in it since 2014. Almost all of the lighting fixtures are dated and don't do a good job of lighting our living spaces. We have been upgrading one room at a time, and in the MBR there is one super old ceiling fan that lights the...