Although this is not a stitch known for counted work, it does look best of a gridded fabric like Aida.
I used six stands of DMC cotton and the result is very thick and filling.
Teal Wool Tailoring Scribble Cloth
The two blocks look untidy with this hard highly twisted cotton thread.
Worked one stitch a line, (in soft silk) it really becomes the Vandyke Stitch. It takes a curve easily.
Sunday Stitch School Reference Chart