Given a playlist URI, we can show the mosaic image.
var sp = getSpotifyApi(1);
var models = sp.require("sp://import/scripts/api/models");
var views = sp.require("sp://import/scripts/api/views");
var playlistURL = 'spotify:user:magerleagues:playlist:5CZ3KO3EExplZOzHDMzgym';
var playlist = models.Playlist.fromURI(playlistURL);
playlist.observe(models.EVENT.CHANGE, function() {
var mosaic = new views.Image(playlist.image);
mosaic.node.style.width = '300px';
mosaic.node.style.height = '300px';
mosaic.node.style.backgroundSize = 'cover';
$('#image').append(mosaic.node);
});
<div id="image"></div>