A shallow dof to block out most of the background would have taken this photo much further. Also, the roses are turned away from the camera. A good shot would show them facing the camera.
I think that maybe the idea in your head was much better than this... It's okay Mine ALWAYS is, haha it happens to us all. Try playing around with the burn tool and see what it gets ya.
This has good potential if a different angle was used. It's a bit busy with too many objects to focus on. I assume this was shot around noon giving harsh, but hazy sunlight. I would study this area shooting during sunrise or sunset and at various angles while aiming closer to porch or other object(s). Good potential.