There are lots of ideas online about quilting an applique project. I would do a google search or go to Pinterest and search "quilting around applique". On the applique projects I have done, including a bed-size quilt for DGD, I did not quilt over the applique as I wanted it to stand out. I did an outline stitch near the applique and then on the wall-hanging projects I did a meander in the background. Actually, on the wall-hangings, I first stitched on the very edge of the applique pieces in a color that matched the applique piece. Mine were made with fusible web and finished as a raw edge applique. Your piece is very pretty!