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HTML 

              
                <div class="bear"></div>
!

CSS 

              
                html, body { height: 100%; }
body {
  margin: 0;
  display: flex;
  font-size: 1vmin;
  background: linear-gradient(to bottom right, white 50%, #eee 50%);
}

.bear {
  position: relative;
  box-sizing: border-box;
  margin: auto;
  height: 40em;
  width: 40em;
  border-radius: 50%;
  filter:
    // Bear Outline
    drop-shadow(0 0 1px darken(SaddleBrown, 30%))
    drop-shadow(0 0 1px darken(SaddleBrown, 30%))
    drop-shadow(0 0 1px darken(SaddleBrown, 30%))
    drop-shadow(0 0 1px darken(SaddleBrown, 30%))
    drop-shadow(0 0 1px darken(SaddleBrown, 30%))
    drop-shadow(0 0 1px darken(SaddleBrown, 30%))
    drop-shadow(0 0 1px darken(SaddleBrown, 30%))
    drop-shadow(0 0 1px darken(SaddleBrown, 30%))
    drop-shadow(0 0 1px darken(SaddleBrown, 30%))
    drop-shadow(0 0 1px darken(SaddleBrown, 30%))
    drop-shadow(0 0 1px darken(SaddleBrown, 30%))
    drop-shadow(0 0 1px darken(SaddleBrown, 30%));
  background-color: #222; // Nose
  box-shadow:
    // Shadow
    inset -6em 0 rgba(black, 0.1),
    // Head
    inset 0 11em 0 8em darken(SaddleBrown, 10%),
    // Mouth
    inset 0 0 0 15em SaddleBrown, 
    // Right Inner Ear
    -11.5em -16.5em 0 -16.5em mix(white, lighten(SaddleBrown, 15%), 40%),
    // Right Inner Ear Shadow
    -12em -16em 0 -16em mix(white, lighten(SaddleBrown, 15%), 20%),
    // Right Inner Ear
    12.5em -15.5em 0 -16.5em mix(white, lighten(SaddleBrown, 15%), 40%),
    // Right Inner Ear Shadow
    12em -16em 0 -16em mix(white, lighten(SaddleBrown, 15%), 20%),
    // Right Outer Ear
    -12em -16em 0 -14em darken(SaddleBrown, 15%),
    // Left Outer Ear
    12em -16em 0 -14em darken(SaddleBrown, 15%),
    // Nose Shadow
    inset -5em -29em 0 -10em black;
}

.bear::before,
.bear::after {
  content: '';
  display: block;
  border-radius: 50%;
  background-color: transparent;
  position: absolute;
  z-index: 5;
}

.bear::before {
  height: 10em;
  width: 5em;
  top: 7em;
  left: calc(50% - 2.5em);
  box-shadow:
    // Right Eye Reflection
    -6em 0 0 -2em #333,
    // Right Eye Pupil
    -5.5em 0 0 -1em black,
    // Right Eye
    -5.5em 0 0 0 white,
    // Left Eye Refelction
    5em 0 0 -2em #333,
    // Left Eye Pupil
    5.5em 0 0 -1em black,
    // Left Eye
    5.5em 0 0 0 white, 
    // Mouth-Nose Split
    0 15em 0 -2.5em black
  ;
}

.bear::after {
  height: 10em;
  width: 10em;
  top: 29.5em;
  left: calc(50% - 5em);
  box-shadow:
    // Mouth
    0 -1em 0 -0.75em black,
    // Whisker Left Top
    6em -10em 0 -4.75em darken(SaddleBrown, 5%),
    // Whisker Left Middle
    8em -8em 0 -4.75em darken(SaddleBrown, 5%),
    // Whisker Left Bottom
    6em -6em 0 -4.75em darken(SaddleBrown, 5%),
    // Whisker Right Top
    -6em -10em 0 -4.75em darken(SaddleBrown, 5%),
    // Whisker Right Middle
    -8em -8em 0 -4.75em darken(SaddleBrown, 5%),
    // Whisker Right Bottom
    -6em -6em 0 -4.75em darken(SaddleBrown, 5%);
}
!

JS
!
999px

Console