This was a real tough one for me. I spent a good part of the day trying to work out what I'm going to do. At first I thought I'd actually go for something more realistic but decided to stick to my traditional cartoony style. Looking at references though the Minecraft inspired slime hat just looked too cute though so I had to go with it.

about 2.5-3 hours.

This gal, even though she doesn't really have bones, organs, or anything else we'd recognize in mammalian life forms she still likes to show off "muscles". Being a slime she can adjust her figure, shape, and proportions as she wishes to a degree and is mimicking humanoids. I decided the shard in her head is actually her though. The mind and personality. Ascending a mindless slime into something more. It doesn't have to be in her head though, she can move it anywhere in her body, just sporting it there as a style choice. If someone was to take it out the body would just return to being your normal every day slime form and an angry magic crystal would be in your hands.