Here goes. I do not like the location of the Buckthorn but I can't say why. The holly and boxwood are fine. They will require regular pruning to stay below the window height.

I would rather see perennial groundcover in front of the boxwood. I dislike the curvy bed shapes.

I wonder if the flowers might be better on the right side of the path. There is more room on that side.

Most importantly, I would like to see a new path with a more graceful curve and a wider width.

You'd be better off to move the 'Jane' Magnolia farther from the house. It doesn't have sufficient room to develop and make the statement I think you are trying to make. It's best if you don't pinch off the approach to the entrance with plantings. Actually, the walk is VERY narrow. It would be better if it was wider, which could be done by adding a brick solider course to each side, or by replacing the whole walk. At least the portion near the stoop needs widening. I'm suggesting a bed line that doesn't swoop outward as it approaches the walk. Having it do that is a common thing these days but not a good idea. (Where the bed line intersects with the walk, it should be a 90* angle.) Presumably, at some point, you would have plantings along the side of the house. I'm showing a bed line that could accommodate that.

One tip, when you're brainstorming a landscape plan, don't use symbols for individual plants. Instead, draw outlines for plant groups. That way, the finished product will be more realistic and you'll be able to better understand the shapes you're making.

The deer will love the holly, and possibly the mugo pine. And if the house faces North, the coreopsis or daisies will not like the shade. The coral bells might be fine, but the deer will like them, as well as the daisies. I would consider for the perennials deer resistant/shade loving plants like Brunnera, Pulmoneria, Liriope, or, for a groundcovering shrub, if you live in zone 6 or higher, Sarcococca hookeriana var. humilis. Deer resistant, evergreen, and needs shade.

And I agree that the little bit of lawn to the left and inside the path should be part of the bed.

I've never grown the plants mentioned, but when I looked up the hollies online, one website said they grow 8-10 ft. tall and 6-8 ft. wide. If that is true, you might want to choose another shrub you won't have to fight to keep from obstructing your windows.

I agree with the Brunnera, Pulmonaria, Astilbe for perennials. Consider filling open areas of the bed with pachysandra. It will give it a lush look. I am leery of the junipers and mugo. That's a lot going on in front of your house.

looking at your dog make me think that it is better to start flowerbed on the right corner of the property. The house is beautiful and it is good to keep straight geometrical lines .