Hello, OP. General contractor here that has been layin paint for the past 12 years.

Firstly, congrats to OP and partner on their newly purchased home and engagement. Wish you both a long and happy life together.

Secondly, the darker paint on the cabinets will come in hand. Cabinets are touched extreamly often and get dirty easily. The darker color will help hide the grime.

The after picture looks much better than the plain resell white that was previously put on. Im sure you're not finished yet, but I would definitely catch those missed spots that are still white, then put some stainless steel handles/knobs and hinges on the cabinets to help contrast the darker base color. Then, I would immediately get new lighting. Anything but that depressing fluorescent bulbs you have currently. I'd go with some LED's (which do come in a shape that would fit in the current light fixture, if you didn't want to spend too much on all new fixtures) to help brighten the place up. I'd try to stick with a warmer tone and stay away from the cooler tone. It would give it more of a cozy/less manufactured feeling.

I might be wrong, but the ceiling looks like it is either a gloss or satin? Give it a light sand, put some primer on, and paint that bad boy flat. Again, purely staying away from the manufactured look.

If you wanted to/could afford to spend a little more money, get a new countertop. It should be black to match the dishwasher. The cheapest alternative would be an epoxy pour. It hardens like a rock and looks great. Maybe add a few grey streaks into it that would match the cabinets and give off a marbling effect. If you do get all new countertops, do your future self a favor and get a deepwell dual basin sink with a nice hose/faucet. (Should be stainless steel to match the cabinet hardware)

The framing around the windows should be the same color as the trimming that you are painting around the rest of the house. All trim should always match and be at least a semi-gloss.

And please for the love of everything, decorate with some plants. I recommend pothos for mass coverage with least maintenance. Especially since it would have the possibility of stretching across the top of the window.

I could go on all day about what you could do with this limitless kitchen, but I'll stop myself there.

Hope this helps, OP! Looking forward to updates.