That's a great section of track, especially around the forests in Pemberton-Northcliffe, some great granite outcrops at Mt Chance/Woolbales, then changes to coastal scenery from Mandalay onwards. If you can extend further to Denmark, even better - some great coast scenery and karri forest. Walpole to Denmark is excellent!
For more detailed info, check the official Bib Track site, lots of great info. And there's quite a few blogs with lots of pics as well, google is your friend.
I just spent a few days between Broke Inlet and Walpole over New Years, including an overnighter into Nuyts (just before Mt Clare) which is highly recommended. Fresh running water at the Peppermints before Thompson's cove. But it was very hot. And you will see plenty of snakes. I had quite a few encounters, including one IN the hut!!! So make sure your snake first aid is up to date. And I'd suggest to pack electrolytes too.
Not many walkers this time of year, I saw maybe 2 sets of people, all huts to myself. The cooler sections or towards touristy spots you'll see some daytrippers, especially if weather is cool for hiking.
Have fun, it's a great part of the world.