saw this challenge today and since it seemed like nobody was going to do it, I thought It'd give it a go but will admit it's not a great image to work on. First thing I did was crop out the people and make it more pleasant to work on. I then added a bit to the canvas size with black to the left and imported into Lightroom.
Created a bit of vignette.
Brought back into Photoshop. Selecting the subject in photoshop was not doing a great job, but was pretty good on the top of the bouquet.
Selected portion of the top, copied and put on a new layer then using the select and subject, and then I inversed the selection,and blacked out were we could still see people behind. This PS selection did not select in between the ferns, so selected all those areas with the lasso and alt key and filled all those areas with black.
Then drew in some weird flower on the left side that was definitely not a sunflower and a few ferns. Just a shape and coloring ... I know how to draw so it is what it is!
Copied a fern from the right side and rotated it horizontally and moved it to the left.
added some tiny sprigs to both sides. and then cleaned out the bottom portion to leave something for the vase to sit on but not all the junk.
I guess there are easier ways to do with AI but I haven't tried them as I haven't done anything like this in ages, and don't know the tools, so went old school. I also got distracted with Biden dropping out and listening to stuff about that, then supper and just before going to take a shower, passed by my comp and realized I hadn't finished.
Do I like it? not really but it fills the brief. I wouldn't do it for a client because they would probably want something better.
But hey, I tried and hope someone else does too. As I said earlier, it is what it is! :-D