It's finished!! This is Assisi pushed in my own direction. Below you can see all the colours I used. I did not plan the stitching, the ideas came while working on it. I practiced a lot of different stitches: herringbone stitch, (half) chevron stitch, bullion knots, French knots, cast on stitch, buttonhole stitch, chain stitch and variations, Algerian eyes, fly stitch, cross stitch, Cretan stitch, bonnet stitch, woven and whipped wheels, Basque stitch, satin stitch, wheatear stitch, Portuguese stem stitch, (spiral) trellis stitch, arrowhead stitch, buttonhole bar stitch and drizzle stitches.
Added: I turned this embroidery into an ornament, just take a look
here.