You can paint all the main doors black but not others, like the closets in bedrooms, or the inside of the bedroom doors, for instance. If your closet is in the hall and it's a bi-fold or otherwise a different style from the doors to the rooms, you could keep the closet door white like your trim. When you're in your hallway or entrance way, all the doors which are identical in style should be identical in colour.

Great! For a small house, there are a lot of doors! Great advice. Thank you so much!