Before. First, I scraped off the high points with a putty knife, then sanded the walls with my electric sander. Very dusty.
Sanding only took me half-way so I covered all the walls with joint compound, sanded them with sanding mesh and then again with a damp rag.
Touch-up and priming.
I glued this outside corner piece on because joint compound is not the strongest stuff-I didn't want it to get dinged up.
After. Finally, I painted (Glidden "Goodnight, Moon"), caulked the shower side and installed the hook. Hurrah! (I'm thinking about putting a second hook lower down for the girls to use. Will that just look weird and get in the way? Any thoughts?)