You link to whats basically a half cilinder, thats no model at all. There are plenty of slime in the archives:

https://opengameart.org/art-search-advanced?keys=slime&title=&field_art_...

Also you would be more lucky to get someone to help you if specify what you want, like low or high poly, pixelated or HD textures... or at least some decent concept pic.

I have sent you an email please take a look.