Mexican embroidery— see what I mean? All regional applications of embroidery in Mexico are so exquisite! I grew up/live in a place where Mexican textiles (some antique!) are abundant, yet I never grow tired of the beauty of Mexican design.
The first stitch is a single herringbone and then filled in the curve with closed herringbone making bigger stitches on the outside curve. I suggest you draw the shape/curve you want onto the fabric. It is quick and easy to do and can be used 'as is' or add extra stitches and beads for a CQ block.