This poster restoration stuff is going to go more quickly than you can imagine, and it's all because you made the up-front effort to trace out all the graphic elements.
Let's keep going:
Adding Foreground Elements to the Poster
On the Paths palette, click on the Black path title to make it the active path.
Click on the default colors icon on the toolbox (or press D for the default colors).
Click on the White path title. ...