What do you need help with specifically?

I think that size looks okay. I like the idea of no buffet. Then I would put an area rug underneath that will also fit the chairs when they are pulled out. That will help fill the space without the buffet. In my house, our setup is similar, and our table isn't quite centered on the sliding doors and it still looks okay. We left more room on the right for foot traffic to the sliding door. Edit: just noticed yours isn't even quite centered...without the buffet you can pull it further left

i like the table. I like the idea of a bench on one side because it breaks up the symmetry and makes it look interesting. You could do a backless bench on the right side.

These are all just my opinions, and I am only average at this, keep in mind....

overall I love the color scheme....adding some black but not full black

You could put the buffet closer to the front of house, by the big floor vent?

The size seems good. I like the color of the base with your cabinets and the wood looks like it will work well with your floors. I don't know how long the wall with the picture on the right is, but you could possibly add a buffet there.