I think adding "stuff" around it detracts from it. It's very striking, I would leave it as is.

You could also take the matching paint and adjust the mural by painting over some of the places that end abruptly at the edge. For example, on the top left paint over to the curved area so it isn't a vertical line.

Would have been better if you had been able to order a slightly larger size and then trimmed it down to fit your wall.

Maybe find a local faux-painter to "blur" the lines between mural and wall ...

So much more impressive without a plant covering part of it. The black edges are nice. You are good to go. Enjoy!

Consider buying a 2nd of the same mural, and cut it to fit and align the pattern around the edges

I would cut the three flowers out that I circled. Paint the wall where they were removed black, and move those three pieces to the corners so that it expands the entire mural. You could also order a small additional amout of paper, cut a few additional flowers out, and fill in the gaps.