Every scene you write should move your story forward and it should do something to your character.
Move the character forward or keep the character from having something, a goal, another person, etc.
Every scene should show that the character is involved.
Every scene should be logical.
Every scene should have a beginning, a middle, and end.
Every scene should keep the reader interested, with conflict, villains, alliances etc.
And most importantly every scene should keep your readers interested.