Every scene in a book should have a purpose. Part of that purpose should be to show how a character is progressing through their arc.
Showing Character Change
Every scene should demonstration some form of character change. The change exhibited may be subtle, especially if it is a transition scene or largely informational. When considering how to show how a character is changing, think back to the character arc and what point the character is on the arc at that moment.
The change shown should show development and growth of the character in reference to previous scenes, or show backsliding behavior that may lead toward a crisis. The change shown should be related to what is happening in the scene.
Whatever happens in the scene should have an impact on the character, eliciting change on some level, whether emotional, mental, or behavioral. Change should match the character and the event to keep it realistic. A minor even that creates a major change will feel forced to the reader.
One character may also see an event as not a big deal, while the other sees it as a huge problem, so be sure to consider the character’s personality developed up to that point. The character needs to react and change according to their perceptions.
Staying on Point
Scenes should leave out all the boring and non-important details of the characters’ lives. Life may be filled with the mundane, but scenes should not include details that are not relevant to the scene’s purpose.
If the information, actions, or dialogue don’t pertain to the purpose of the scene, cut it out and reevaluate what is needed to move the scene forward.
Consider starting in the middle of a scene, with action of some kind, and leave out the movements in and out of the scene. This helps curtail unnecessary details that will bore or confuse the reader. Irrelevant details can make the reader focus on the wrong information, thinking it is important to the story or scene.
Only insert backstory when it doesn’t slow the present scene. If a large portion of backstory explanation is needed, structure the scene around that information rather than trying to insert it into scenes with a different purpose. It’s also important only to share relevant backstory information needed for that particular scene to keep from bogging it down.