Converting a wall fixure

Help! I have a project I'm hoping someone can talk me through. I am attaching a photo of the 'look' I am trying to achieve and the help I need. I have a wall light fixture that I would like to replace with a chandelier like the picture shown. Also, the mirror is too tall to use if I don't change out the fixture so regardless, the light will need to be changed out somehow.
How will I convert the electrical outlet so that I can wire a light, either ceiling or higher than existing fixture? My guess is I will need to direct-wire a light.?.
The ceiling above the bathroom is our bedroom floor upstairs. The existing light is on an exterior wall. I just don't know how to make a wall electrical outlet accessible for a hanging light.
Any help would be greatly appreciated!!
Well it only let me post 1 of 3 pictures