I’m going to start designing mobs soon, but first I will release the 100% block-complete Vanillaccurate pack. In the meantime, here’s a preview of what mobs might look like (although you have already seen the shulker, but seeing as the box is used as a portable chest, I want to leave it in the base pack).
Here is my rendition of the creeper !
HardTop Vanillaccurate 