Does your screen name indicate you live in Michigan? No way to offer planting advice without knowing your approximate location.

Does simplistic mean easy to care for or a clean modern design? I don’t know where you are considering box, it can grow taller than a house without constant shearing and is best in formal gardens. You need dwarf shrubs and perennials.

There are modern boxwood varieties that will remain low or can be trimmed for shape once or twice a year. Baby Gem.

Winter Gem is another. If you're Z4 open to West winds and a run of days down around -20 can be a problem. A good watering late in the season helps for winter survival.

Yes, Michigan is the location. A modern, clean design or ideas would be nice. In the past, we had boxwoods with hydrangeas behind them, and I'd like a different look.

The path to the house is much too narrow and skimpy for the size and style of the house.

If your zone is 5 or above, consider Geranium maccrorizum or G. 'Karmina' or 'Biokovo' for groundcover. The first is a little larger than the other two and better is full shade, the last two fine for full sun. All of them are highly deer resistant and weed suppressing, easy to control, and flower in late spring. Need almost no attention.

The overly pruned hedges on the left side near the house are unattractive and need to be replaced with better choices.

It looks like there is a lot of gravel mounded against the wall of the house. It should be lower than the foundation.

Are you planning on doing new planting for the area on the left side of the pic or are you keeping that?

Drive your neighborhood and see what others have done that you like.

Nothing about boxwoods and begonias sounds clean and modern to me.

The walkway should be widened visually with rock and edging on both sides from the porch to the driveway. Incorporate the drain cover.

Since you asked for landscape ideas, the foundation work looks wrong. Surface water only needs 2 or 3 inches of grade to flow downhill. The huge berm piled up against the house looks odd and will wash mud onto the walk in the rain.

For the front something formal and symmetrical and clean lines. With some hardscape is a nice contrast to the natural surroundings of the property.

You could substitute some of the plants with ornamental grasses for a modern touch that gives some softness and motion in the breeze.