beautiful cabinet color and mudroom design. You could consider adding a little bench that connects from mudroom side around wall leading to den. Would give some added storage under and another place for them to sit and get ready.
I love the "frosted" glass instead of a solid wall used in this space! the space created for the"water closet" in new homes today is so tiny; this would at least give the feel of a bigger space, and add character to the entire master bath.