I also did the same design on the blue medallion fabric but it was much more difficult since I couldn't see my stitches on the busier pattern. I tried flipping the sandwich over and quilting directly on top of the batting but that had its own challenges. I could see better but my hopper foot kept catching little fibers. I also didn't think the stitches looked as smooth or flat on the fabric side. Ultimately I ended up flipping it back to the fabric side and used my closed darning foot.
I originally thought that it might be another Christmas gift in the making but I just might have to keep this one for myself! I finished the bag last night so I'll post pictures soon.