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HTML 

              
                .creature-cage
  .creature-body
    .eyeball
      .brow
      #leftPupil
    .eyeball.right
      .brow.right
      #rightPupil
    .hair-tuft
      .hair
      .hair.hair-middle-dark
      .hair.hair-right
    .hair-tuft.hair-tuft-right
      .hair
      .hair.hair-middle-dark
      .hair.hair-right
    .mouth
      .tongue
      .drool
  .hand.hand-left
    .finger
    .finger.finger-middle
    .finger.finger-right
  .hand.hand-right
    .finger
    .finger.finger-middle
    .finger.finger-right
!

CSS 

              
                body
  background-color: dimgray

.eyeball,
.hair-tuft,
#leftPupil,
#rightPupil,
.drool,
.hand
  position: absolute

.creature-cage
  position: relative
  margin: auto
  border: .5rem solid #090909
  background-color: #eee
  @media (min-width: 768px)
    width: 24rem
    margin-top: 5rem
    
.creature-body
  height: 15rem
  margin: 10rem auto 0
  border-radius: 60% 60% 0 0
  background-color: #5e35b1

.eyeball
  width: 50px
  height: 50px 
  top: 30%
  left: 20%
  border-radius: 50%
  padding: 22px
  box-shadow: 2px 8px 6px darken(#280680, 5%)
  background-color: #1de9b6
  &::before
    content: ''
    position: absolute
    width: 20px
    height: 15px
    border-radius: 50%
    background-color: #FFF
    z-index: 1
  &.right
    left: 55%
    
.brow
  position: relative
  width: 80px
  height: 30px
  bottom: 45px
  right: 35px
  z-index: 20
  border: 6px solid
  border-radius: 50%
  border-color: transparent
  box-shadow: 3px -5px 1px #090909
  transform: rotate(-20deg)
  &.right
    transform: rotateY(190deg)

#leftPupil,
#rightPupil
  width: 30px
  height: 30px
  top: 2.3rem
  right: 1rem
  transform-origin: 1px
  border-radius: 50%
  padding: 2px
  background-color: #090909
  &::after
    content: ''
    position: absolute
    width: 32px
    height: 32px
    bottom: -4px
    left: -3px
    border: 5px solid #b2ff59
    border-radius: 50%
.hair-tuft
  width: 65px
  height: 50px
  left: 10%
  bottom: 25%
  &.hair-tuft-right
    left: 75%
    bottom: 13%
    transform: rotateY(180deg)
.hair
  position: relative
  width: 35px
  height: 50px
  clip-path: polygon(50% 0%, 0 100%, 100% 100%)
  background-color: #7441d9
  transform: rotateX(180deg)
  &.hair-right,
  &.hair-right-dark
    left: 40%
    bottom: 200%
  &.hair-middle-dark,
  &.hair-middle-light
    left: 20%
    bottom: 100%
  &.hair-middle-dark
    background-color: #4f2c94

.mouth
  position: relative
  width: 19%
  height: 21%
  left: 39%
  top: 45%
  border-radius: 13% 13% 50% 50%
  background-color: #090909

.tongue
  position: relative
  width: 72%
  height: 26%
  left: 7%
  bottom: -46%
  border: 6.5px dashed
  border-color: transparent transparent white
  border-radius: 50%
  background-color: #ec407a

.drool
  top: 61%
  width: 10px
  border-radius: 27% 50% 20% 77%
  box-shadow: 4px 8px 7px darken(#280680, 5%)
  background: linear-gradient(#00bcd4, #80deea)
  animation: drooling 2.5s 2s cubic-bezier(.73,-0.44,.43,1.49)
  animation-fill-mode: forwards

.hand
  width: 90px
  height: 55px
  top: 96%
  &.hand-left
    left: 10%
    transform: rotateY(180deg)
  &.hand-right
    right: 10%
  .finger
    position: relative
    width: 25%
    height: 85%
    border-radius: 20% 20% 50% 50%
    box-shadow: 0px 3px 15px #090909
    background-color: #9162e4
    &.finger-middle
      width: 25%
      height: 94%
      left: 29%
      bottom: 80%
    &.finger-right
      width: 20%
      height: 68%
      left: 60%
      bottom: 164%

@keyframes drooling
  0%
    height: 0px
    opacity: 0
  70%
    height: 20px
  100%
    height: 42px
    opscity: .5
!

JS 

              
                const rightPupil = document.getElementById('rightPupil'),
  rightPupilPositionInfo = rightPupil.getBoundingClientRect(),
  leftPupil = document.getElementById('leftPupil'),
  leftPupilPositionInfo = leftPupil.getBoundingClientRect()

const Eye = class Eye {
  constructor(pupilDirection, pupilPositionX, pupilPositionY) {
    this.pupilDirection = pupilDirection
    this.pupilPositionX = pupilPositionX
    this.pupilPositionY = pupilPositionY
  }
  
  findAngle(cursorY, cursorX) {
    let angleDeg = Math.atan2(cursorY - this.pupilPositionY, cursorX - this.pupilPositionX) * 180 / Math.PI 
    //angle in degrees
    angleDeg = (angleDeg >= 360) ? angleDeg -= 360 : (angleDeg < 0) ? angleDeg += 360 : angleDeg -= 360
    this.rotatePupil(angleDeg)
  }
 
  rotatePupil(angleDeg) {
    this.pupilDirection.style.transform = `rotate(${angleDeg}deg)`
  }
}

const rightEye = new Eye(rightPupil, rightPupilPositionInfo.x, rightPupilPositionInfo.y)
const leftEye = new Eye(leftPupil, leftPupilPositionInfo.x, leftPupilPositionInfo.y)

 const getCursorCoordinates = (e) => {
    let cursorY = (e.clientY),
        cursorX = (e.clientX)
   rightEye.findAngle(cursorY, cursorX)
   leftEye.findAngle(cursorY, cursorX)
}
 
document.addEventListener('mousemove', getCursorCoordinates, false)

// var eyeFollow = (e) => {
//   let y1 = (e.clientY),
//     y2 = pupilPositionInfo.y,
//     x1 = (e.clientX), 
//     x2 = pupilPositionInfo.x, 
//     angleDeg = Math.atan2(y1 - y2, x1 - x2) * 180 / Math.PI; //angle in degrees
  

//   if(angleDeg >= 360){ 
//     angleDeg -= 360;
//   }else if(angleDeg < 0){
//     angleDeg += 360;
//   }
  
//   pupil.style.transform = `rotate(${angleDeg}deg)`
// }


// function eyePoke(e) {
//   //gets position of our eye relative to the body
//   let x = pupilPositionInfo.x - document.body.offsetLeft,
//     y = pupilPositionInfo.y - document.body.offsetTop,
//     eyeballWidth = parseInt(window.getComputedStyle(eyeball).getPropertyValue("width")),
//     y1 = parseInt((e.clientY) - y),
//     x1 = parseInt((e.clientX) - x)
 
//   // checks position cursor to keep it confined to eye area
//  if(x1 > 0) x1 -= x1; //15
//   if(x1 < (eyeballWidth * -.5)) x1 = -40; //-40
//   if(y1 > (eyeballWidth * .25)) y1= 20; //15
//   if(y1 < (eyeballWidth * -.5)) y1 = -30; //30
//   pupil.style.transform = `translate(${x1}px,${y1}px)`
  
// }
!
999px

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