What you have done is really nice - -
I think one could get fairly close to the beading with a zipper foot -
Quilting around the designs does make it look nice on the back, too.
It may be that you will be able to put some things on "now" - but things - like a jingle bell, maybe - might work out better if added after the quilting.
Some of it might depend on how close you want to get to the design - and how close you can get with your machine's attachments.