I think you could bring the tree next to the house forward by adding the trunk and anchoring it out in the lawn at the edge of the path like in the photo.
Also, I think maybe the grassy fabric is bothering you as it is very busy and doesn't set the same tone as the lawn in the photo. Perhaps a tone on tone green would give you more of the feel you want.
I'm also positive once you get the fence in, it will make a big difference in the look of the whole thing.
Overall, it's a lovely piece and you are doing a great job on it. I'd love to have done it, but I too, am afraid to start on something like this.
Hugs and smiles,