Rather as I looked for problems with the novel's overall structure, I'm looking for problems with the scene as a whole - outside working in again.
* is it clear where and when the scene takes place (preferably contained within the first para)?
does the timing make sense, do people have long enough to go from A to B, or conversely, if A and B are close together, do they cover the ground quickly?
* are people active throughout or are there any bits when the characters are waiting for something to happen? Do I need to re-write to correct this?
* is it clear what the characters' attitudes are to each other, the location, the situation?
* are any patches of description too long? too wordy? too complicated?
* is there enough description of setting etc?
* if I have to describe a place or an action, is it easy to understand what's going on?
* are characters moving about, or are they static - worse, are they drinking tea? Could I move it to another location which would add a new dimension to the scene?
* if there is flashback, is it justified? Is it adding to the storytelling in an active way? Is there any way i could incorporate the information into the narrative?
* am I moving the story forward?
* is the scene anchored in reality or has it floated off?
* does the balance of white space to text work?
* is the scene too long or too short? Is there enough going on, or too much?
* does it end at the right place?
* would a reader want to read on?
* does the scene have the right pace, is there a good shape to it?
* does something happen? Or is it just events?
* are the characters plausible, consistent, believable, sympathetic? Would I like to spend time with them?
I go through every scene in this way and re-write until I feel I've dealt with all the queries, issues and problems. This may involve moving bits around, cutting and adding. That done, it's on to the next stage...