Yes, I did read the same thing after your last post. So that particular mirror may be slightly off in width if my math is correct. Good thing about the quatrefoil mirrors, if that is what you chose, you can most likely find another that is wider. I would take some newspaper or something else and cut out a paper version of the mirror in those same measurments. Tape it up with some painter's tape in the space to help you visualize.

My spare "inventory of stuff"

I assume you have a hall closet so get rid of the coat rack, it crowds the space and looks messy. Definitely add a large rug instead of the small one, you'll want to protect those wood floors as much as possible. I think guests to your house would certainly appreciate a bench for putting on shoes. But then a table with storage is good for gloves keys etc. So it's a toss up. Whichever way you go, add a mirror above. It's so handy to check yourself before leaving the house. That's a great looking dog you have. Tell him/her that Brown Dog says hey.

If you decide to add a plant, heart leaf philodendron can survive in low light but you might want a couple of pots so that, as with any plant, you can move it to the sunshine part of the time -- perhaps about half the time. If you turn the mirror and prefer not to have something tall in front of it, consider adding a wood box of some kind in the middle such as a jewelry box or humidor or recipe box If you're wanting something that will be used, perhaps a box for organizing items you might want to "dump" in the entry would be helpful. https://www.amazon.com/Section-Desk-Letter-Holder-Finish/dp/B00UM112UY/ref=asc_df_B00UM112UY/?tag=hyprod-20&linkCode=df0&hvadid=242025903242&hvpos=&hvnetw=g&hvrand=11000425592769071470&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9011018&hvtargid=pla-406060216049&psc=1 If you choose to add a couple of lamps, consider matching the metal of the cabinet hardware.