People respond better if they don't have to go look for your pictures:
It looks very shaded by your big tree, which also blocks the view of/from your house. If it were me, I would get a tree-person to come and limb it up a little bit.
I think the commonest landscaping mistake people make is to make foundation plantings too small and skinny, all out of scale with the big house right behind them. You could easily make everything behind the horizontal walkway that goes across the front of the house foundation planting.
Then you need some shrubs and bigger plants. The pieris japonica is nice and will get bigger. Everything else is forbs, except your rose standard. A couple more shrubs would really help.
Now we get into things that are strictly personal taste. But to me, everything else you have is kind of loose and informal, but the rose tree pruned to standard shape is a very unnatural/ formal look, doesn't quite seem to fit.
And you are going to have trouble having the ends match, because where the rose is looks pretty sunny, but the other side of the house is under the tree and quite shady. That's why the rose on that end died. You can look for two different shrubs with a somewhat similar size/shape/ effect.
A simple thing to make it more "stunning" is just to fill in a lot of the mulched space with flowering annuals. You can buy them in six packs very cheaply. This fall plant a bunch of bulbs for spring flowers.