.minicart-wrapper {
margin-right: 10px;

.action.showcart::before, .action.showcart.active::before {
  display: inline-block;
 white-space: nowrap;
word-wrap: normal;
direction: ltr;
content: 'e8cb';
color: @color-white;
-moz-font-feature-settings: 'liga';
-moz-osx-font-smoothing: grayscale;
vertical-align:middle;
}

.minicart-wrapper .action.showcart:before {
         content: url(http://your-domain.com/.../cart-image.png);

}