Well, let's see if this works; I uploaded a photo of all three sizes to Discord a while back (I had a commission from a friend who wanted "growing" brain slugs to wear on con weekends), and Discord provides direct links. If not, it shouldn't be too much trouble to do some uploading.

Edit: Just in case, here's an archived version of the website where I first got the original brain slug crochet pattern. You should be able to see the two original sizes in a pic there. I made a pattern for a third one, not quite half way between the two in size, and a slightly different texture since I prefer double crochet to single crochet.