Welcome Annalisa - it's a gorgeous quilt - love the fabrics!
If your machine has any decorative stitches, you could use those rather than 'stitch in the ditch'.
To get a good idea of what they'll look like, you could do up a mini-sampler 'stitch map'- make up a little sandwich about 6" x 24" or so, and do a sample of each decorative stitch on your machine. You could also play with stitch length or width, and even regular thread or variagated. It's amazing how different the stitches look than the little icons on the machine. I still refer to my stitch map that I made years ago.
The main thing - enjoy the process!