What a beautiful entrance! What’s to the right of the door by the staircase? I agree chairs would be odd there. Depending on the amount of space I might do some art (like a sculpture) or a plant.

Also, a console table and a mirror for a foyer is very typical.

Very pretty home!

Could I please see a photo of the space straight on? Hard to get a concept of exactly how much space is there. Thanks!

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Beautiful entryway! Not every space has to be filled.

A photo of the space from the entrance would make it easier to judge whether it needs furniture and if so, what kind. The entry is very formal, so some common arrangements would look out of place, but you could easily find a seating arrangement that looks gracious rather than like a waiting room, and similarly with a round table with flowers, etc.

A picture facing the wall from the first stair landing...from the front door ..and facing the office door wall are necessary for more informed suggestions...art is the safest starting place since the space is so grand and furniture may break up the lines and add a feel of overlapped clutter to the space...the one exception ...that would be appropriate ....if there is room ....is the round table and floral suggestion

Definitely need more photos. Take 180 degree photos standing at front door and a couple facing stair sides and your office door.

I looked at your idea books but the photos seem less formal than this grand entrance to your home. What style is in rooms adjoining this entry?

Do clients come to your home?

Following.

Without having more info I immediately think a desk with ottomans or unique simple bench.

I think some well-sculptured tallish plants would soften the space a bit.

I am adding a few more photos for different angles

...following

Unless you need something there functionally, I’d add an interesting plant.

Agree with a round table as first choice, or an armchair and floor lamp, to give a little place to perch...

Here is another idea.

In the entry along right wall after first opening I would put an slightly unexpected look using black and white at slightly modern look. Then, in nook by office I would create small seating area like this.

It really comes down to what you like/need. I would keep it simple. You have busy molding and balusters.

Here are a couple mock ups for you.

Fun space. Interesting low stools with a picture leaning against wall and vintage riding boots. Textured, bold color and interesting lines for your choice of stools would be one of many options. A lucite table with artwork or sculpture. Stool with stacked books. Lucite table with stool underneath or riding boots. Lots of options. Not sure your office decor but if you keep door closed treat it as receiving area for guests. Simple and understated.

It a pro but simple and a little fun lamp.

First I would like to say I'm not a Pro but...
This is what I chose for your area of concern. :)