Because I had a few people ask, I thought I should whip something up really quick :3c
I'm not saying this is the proper way to shade them, but if you like how my slimes look, then this is for you!
Also, hooray for Paint!!
Keep in mind when applying highlights, you want to make them round and shiny, like putting light on Jello. Or go with what your slime is made of. This is just for a generic Jello/Water slime.