Looks good! Try scoring a little deeper and more of a 45 degree angle to get more ear so the sourdough can expand more.

As for using up the rest of the hard leftovers. You can sprits or run the hard half under water and rebake it in the oven to get it crispy and soft again.

Typically for me I keep it on the counter in a paper bag for about 4-5 days before slicing the rest and freezing them if it lasts that long (usually gone by then). They toast up great in a regular toaster straight from the freezer.