One chair just won’t do for this scene since there are two place settings so I need a second chair. I could copy the one I have and use that and be done with that. Of course, you know that is not going to happen.
So a second chair must be modeled. I wanted it different from the other one so I chose to do something based on, but not exactly like, one of my own dining chairs. Incidentally, the round or hoop back chair is similar to a chair I once owned.
Back to the second chair.
I decided to do something with more of an overall square shape instead of the round. You would think it would be much easier and go much smoother in the modeling, and while for the most part it did, I still ran into a few issues. The need for edge loops to maintain the shape and the harder edges was even more important. And I found trying to get the legs and the seat to fit just right was a bit awkward. I had tried to model the seat base and cushion from one primitive and that did not really work out when it came time to notch out the seat to accommodate the legs. 
As you can see I decided that the cushion and the seat base should be modeled from separate primitives. This really worked out better as I was better able to fit the cushion onto the seat and in between the back risers.
I found a nice cloth material for the seat cushion and used that so it adds some interest to the scene as well.
I think the two contrasting chair styles are fun. 