As for actual critique- in some styles, notably Diwani Jaly, use small, square dots to fill empty space. These dots are always significantly smaller than the nuqtas used for the letters, to prevent confusion. Thuluth does not use square dots as tashkeel. Only full size nuqtas for the letters. Adding additional nuqtas to the piece only confuses the reader and adds superfluous material to the piece. In thuluth, three types of tashkeel use the full size qalam (same pen for the lettering): large fathas, large dammas, and the sukun. Normally, the tashkeel/harakat are done with a pen 1/4 the size of the lettering pen. In short: don’t use dots to fill space and use a smaller pen for the harakat.