For Master Bedroom: Whatever your closet space, Peri Wolfman advises "potentializing all the storage possibilities" by making use of multiple levels (these racks are two bars deep), placing shelves over doors, and putting hooks on bare walls.
13 Creative Ways to Organize Your Shoes, Inspired by Pinterest
traditional closet by Dijeau Poage Construction. Instead of a walk-in closet, turn a small hall into an open closet. Implementing tidy open shelving and hanging rods negates the need for doors, which would impede traffic flow through the hallway.
I like the shoe-shelf, and the basket/hamper space below. Also, on top how the upper two shelves are fixed/built-in, while the other three are floating/flex. This gives a much more built-in feel along with the flexibility of modular shelving