Two types of rectangular head bases (placed on a cylinder for a slightly rounded shape) for building off of.
a lot of my sketches begin with a really basic rectangular shape (or an oval, but my ovals dont work so well (╥‸╥)), and i eventually slapped it on a cylinder so i can use the paper method too without having to draw it myself (because im lazy sometimes).
in the future, i'd like to see if i can make a version where the back of the head plane (the "inside") is bright red or a solid color for easier distinction, but it works good enough for now ♫.
here's an example of how i used it:

i get lazy with sketches sometimes and dont want to plan a full body, but sometimes (for some reason) mapping a rectangular discourages me. or my ocpd makes me think its not actually even. so now i don't have to worry about that anymore!
this material comes with two versions of the head base, for those who would rather map things themself versus those who want the ears/eyes/nose/mouth. you can also edit the texture itself really easily (its just a cylinder with a texture), so you can further customize the proportions for your own characters.
(maybe i'll even go do that too, i haven't tried making custom faces with it yet...)
Category 1