Beautiful table. I don't particularly like the metal/cane chairs. Too 'light' in appearance. Do you use the chairs by the window? I think they are too close to the table and they are too big in comparison. Could be the angle of the photos though, may look different in real life. I don't think your ceiling is too low to hang a pendant above the table. How do you change the table position? If you only turn it around, you can still keep it centered under a light. If you move it to the wall it's another story of course. The two paintings above the console should be hung lower and I prefer them on one level. You can add table lamps on the console and a floor lamp in the corner between the windows. If you use the two chairs, I would add a table in between and angle the chairs a bit. I'll see if I can find you other dining chair options.

The chairs are a good match. Leather is probably best, great for kids' spills and accidents, but any fabric will do. Not sure on purple with green - those two colours together clash a bit for me. The green kitchen looks great, and I'm a fan of dark wood. The only thing throwing it off at the moment is the yellowish coloured walls. If they were repainted a soft white, this would make the green and the dark wood really pop, giving you a fresh and sophisticated, calm look which I think would work well. You could then upholster in a green to match the kitchen which would look appealing. Finish it off by some fresh white flowers as accents in the room to draw the eye and you've got a beautifully transformed space with a fabulous feature dining area :)

Also take a look at Room and Board....they have several tables with different wood finishes or wood/steel/metal bases and a good selection of various tabletop materials. Also if you prefer a wood table, an area rug underneath the table could also help to break up all of the wood too.

I would wait for the rug, until you have the shutters up and your furniture placed..it may take on a character of its own and you'll want to compliment. My first thought though was to coordinate with your kitchen and incorporate some black, with a black/beige stripped rug, which would be fun with the wallpaper and perhaps paint your chairs black, add the shutters and you could paint the window trim black and add a large black chandelier.