Q1. Do not add wall shelves over the current ones.

Q2. The chandelier should run the length of your table - so either turn the table or turn the chandelier. If one of those options doesn't work, then yes, get a new chandelier.

Q3. If you plan to keep the table, I would try taking down the mirror, stagger the shelves in the mirror's current space, and buy some nice art images for above the cabinets. Make sure to move the cabinets a bit closer to the center so they aren't hugging the side walls. Or, try moving the cabinets under the mirror, and lower each shelf so that it sits a bit above the bottom of the mirror. Your space looks like it would look great with a round table. I'd consider it.

You don't necessarily need a new light fixture but you've got it hung in the wrong direction. Linear fixtures should be oriented in the same direction as the table, i.e. turn it 90 degrees so it goes the long way, not across the short portion of the table.

Secondly, you've got too much going on in that small space. I would replace the counter stools with chairs that also have a walnut finish. Something like these, perhaps:

LumiSource Porto Swivel Counter Stools, Walnut and Brown, Set of 2 · More Info

Fabric Upholstered Walnut Wood, 24" Counter Stool, Light Gray, Set of 2 · More Info

Then I would create ONE focal point on the back wall. Lose the mirror and the shelving. Put your colorful print there instead. Agree with Jan that the two cabinets should be pushed together and centered on the wall, to create a buffet-like piece.

Lastly, find a rug that picks up one of the colors from your print to go under the table. A shag might be fun if you're going the mid-century route.

Forgive me, Actually it's a worse view. Show the rest of your spaces.......? : ) Maybe some more major help in order, especially until you outgrow the toddler necessities

About the cabinets -- assuming you want to keep them for storage, could you just rotate them so they are opposite eachother but still in the back corners where you have space for them, but not intruding so much into the focal point of the artwork you are going to move to the space where the mirror is?

"I see" a striking look, but simple lines and modern -- partly cause of the units in the corners having such functional appearance; your art's blocks of color -- lighting with bit of curve.

Shelves that are there don't complement imo.

A quick houzz grab, also in black etc.... and not just because it seems a blend with arrow... but maybe a design like this, oval or what...

Elegant 32" Curved LED Pendant Light PD12732, Walnut · More Info

If width on end wall [of mirror] really works and it's not bad... what about your art to 'show' there, if not any wider than the mirror....then maybe a simple shape [drum?] to not be "lost" seen in same view as art.

The space needs a bit of change

1. I would buy smaller chairs instead of the bigger ones

2. I w would remove the shelves on the wall

3. The mirror with the black border can be changes into a borderless mirror or the whole Mirror may be removed and you can add a artwork on the wall which will create a life to your interior.

4. The most bugging thing is the two chest seperated,,, If the budget allows you mayu change them into a more of a dispaly chest which may be added to the corner of the dinning room and with Plants and arts Work your space will change dramatically..

All The luck ,,, please show us how your space turned to be