Im not sure if youve done anything but the centerpiece is a bit big, so try sizing it down a bit

the background (imo) clashes with the the centerpiece, i would personally integrate preexisting colors into the bg. this can be achieved by finding something with hints of those colors or making your own using this photobashing kind of technique that i personally use where i take photos and use different filters (ex: overlay, color burn) on them
a nice border would be good, but as i replied to one of your other asks, take your time, and look for inspiration. this is really creative already