Right now there does not seem to be any symmetry on the path to your door. I would either eliminate the small trees that are there now, and replace them with bushes or shrubs that are equal in height and width, or cut these back and shape them dramatically, so that you have a clear vision to the door. Second, if you could change out the door, eliminating the side window, that's another idea. Sometimes just replacing your front door with one that is bold in color or style is enough to breathe some life into the front of the house. You could also either replace the concrete with pavers or paint the concrete with stain of a color that blends well with with nature.. like a lighter gray or a brown.

I think a comfortable distance between the island and the counter is around 42". It seems that you have only 30" between your cook top and the counter. I might be a little too tight. The wall between the entrance and the kitchen could be 4' long instead of 6', you would then be able to move the island a foot which would give you more room between the cook top and the island. Could you switch the location of the toilet and vanity in your dad's bathroom so your enter facing a vanity instead of a toilet which is a lot nicer.

The DIY concrete floor finishing products are rarely up to "snuff" for a living situation. Most are meant to be put down in a garage where it doesn't matter if it bubbles and lifts in a year or two. Many have failed because of wrong application technique, wrong use, wrong product for the concrete, etc. A finished concrete floor in a new build is a great option. The concrete professionals will get the surface ready for polishing. The concrete floor finisher (may be a different person than the guy who installed the slab) will come in and clean/shot blast the concrete and add a layer of appropriate, high-end, high-density concrete. This concrete is then stained (if you want it) or if you want simply polished and coated with appropriate epoxy. It may take more than 1 application of the stain/epoxy to get the look you are after. This is not a "money" saving product...it is a lifestyle finish that is equal to (in price) other medium/high end finishes. It is very important to understand the quality of concrete seen with a normal slab/subfloor is NOT good enough to be polished and stained. That's why a new coating of high-end stuff is added to the slab. This high-end concrete has all the right properties to receive stain/polish/epoxy.

Kretetex makes a concrete sealer "Ghostshield Lithi-Tex L9500". This particular one is Industrail Grade, but their website may have a home grade that might work for you.