Beginner Gardening: Having trouble making my new garden "cohesive", 1 by ked1985

ked1985 wrote:
To preface: all these plants are new except the large spruce. We purchased last November and planted throughout spring and summer. The back half of the bed is dirt/mulch and then concrete. The only things that might possibly grow there are iris and sedums (we bought the boxwoods and realized this afterwards).

I know it's a new garden so it doesn't look like many amazing established things I see here. But I feel sort of lost in how to go about making it look cohesive and inviting (feels very "spotty" right now). I tried to fill in the holes with a few annuals, and I have 2 iris coming in the mail soonish. Does anyone have suggestions on plant placement? Or does it look okay? I'd like to keep what I have... except maybe the coneflower in the front, I haven't really been impressed with it. I was considering a raised bed in the back -- I don't mind covering the windows.

Thanks!