That shoe rack looks dwarfed. How about something larger to fill up the space?

If you're going to make people take off their shoes, it would be nice to give them a place to sit down to do so. Signs are kind of rude IMO. Art or a mirrow (for an entry way) would be better.

If you want them to take their shoes off at the door, then give them a stool or bench to sit on right at the door to do so. Older people or people with various physical challenges need the support.

Even with the coat closet right there, I'd still put in a hall tree with a bench and shoe stowage there. It's generally rude for a guest to be opening closed doors in your house without your permission, so it's a good idea to provide them with a hall tree or coat rack so they don't have to ask you where to hang their coat.

Also, if you have a no-shoes house, do you want your guests (or family members) to be going into the living room with their shoes on just so they can have a place to sit to take their shoes off? That's not intuitive. If you have your hall tree bench and shoe stowage right there at the entrance, it's a very clear signal that you need to take your shoes off, and any polite learned houseguest will do so without bidding. Much more effective than a condescending little sign or you standing around to remind them to take their shoes off.

A piece like this if you're wanting it to serve as a place to take off shoes.

Nessa Oak and Black iron Entry Bench · More Info

You could also, do the more traditional slim entry console with a mirror, or artwork hung above

How to Style an Entry, or Console · More Info