The Cute Mob Models resource pack changes the appearance of some of the mobs in the game, making them look like anime girls in mob costumes with a hoodie and stuff. To make sure that this pack works properly, here's some settings that you have to make sure are ON :

"Video Settings → Quality → Custom Entity Models" → ON.
"Video Settings → Quality → Random Entity" → ON.
"Video Settings → Animations → Texture Animated" → ON.

All these settings are OptiFine settings and hence you'll have to use OptiFine to use this pack. Take a look at the screenshots to see what you can expect from this pack.

Download links are given below.

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Cute Mob Models Texture Pack