Do you know what style you are looking for? Since your mirror goes wall to wall we recommend staying with an overhead light such as something below.

Lighting Installation by our Panorama City Electricians

Or you can try doing something a little more fun, by having sconces on your mirror like this:

Wall Sconce Installation by our Sherman Oaks Electrician

As for the flush mount light you can just upgrade it to a more modern light or maybe even replace it with a pendant light so it looks more elegant.

Hope this helps! Feel free to reach out for some more ideas!