After sanding the joint compound, and then painting, another item on the list was caulking the gaps in various places. Here is the gap underneath the stairway banister:
Here it is now after a bead of caulking:
And around the corbels supporting the bar counter (see previous post for before picture):
I used the finishing tool that came with the removing tool. I don't bother with painter's tape. Very little effort and polished results. You just have to deal with having to say caulking.