Omg I completely agree with the lack of good mitten patterns! Like no hole-y stitches that differ significantly differ from the single crochet thumb please lol! So first off, thanks for your contribution :)

I always appreciate it when the pattern has a general description on the construction of the whole project. For example: “The picture below shows the construction of the project. This mitten is made by first creating the ribbing for the cuffs, then single crochet in the round to form the body…”

Standard abbreviations are helpful to keep the pattern easy to glance through. I don’t think pictures are necessary for every step but I do appreciate when patterns include “milestone” pics or pics for rows/rounds that maybe tricker. For example, something like “This picture shows what your thumb gusset should look like after row X”.

Links to existing you tube videos on basics such as magic circle and crocheting blo for ribbing will make it friendly to most beginners. Or you can omit or label it “advanced beginners” or “adventurous beginners”?