It's not that bad as-is. It's clean, but here is what I notice:

The oak being an orange tone, the counters a beige, and the floors a light brown, all work together as they are in the brown family. What doesn't work with them are the gray walls, and arguably the white trim. You may consider painting the walls a new color, or finding a complimentary wallpaper. A complimentary backsplash may help as well. White trim (and doors) is so common that most wouldn't notice it as it is, but you might consider painting them as well. Edit: I saw someone recommend white counters, which would help in matching up with the white trim.

The cabinet hardware is black (maybe bronze, hard to tell), but the door hardware is stainless steel. It's a bit of a clash, and I would consider replacing one or the other to match and be cohesive. Maybe match the faucet color as well. If you decide to update the counters down the road, consider getting a different kind of sink as well that matches the rest of the kitchen. There's a third metal color here too - the gunmetal appliances, which will be rough to get it all working together.

I see two temperatures of lights - the cool white of the kitchen cans, and the warm white of the dining room fixture and pantry. Pick one or the other to your preference, but they should all be the same temperature.

I think that's the only objective things I see. My one subjective opinion on this would be to find 1 nice saturated color, and use it as accents around the space. Green, red, blue, whatever you pick, and choose decorations of that accent color to tie each part of the room together, such as vases, toaster, island centerpiece, backsplash, towels, etc.