How to get MPMediaPlaylist's user defined cover image and description?

I know how to get MPMediaQuery's title by:

MPMediaQuery *playlistsQuery = [MPMediaQuery playlistsQuery];

NSArray *items = [playlistsQuery collections];

MPMediaPlaylist *myPlaylist = items.firstObject;

NSLog(@"%@",myPlaylist.name); //"New playlist title"

Does anyone know how to access MPMediaPlaylist's cover & description?

Screenshot - User created Playlist

I haven't figured out the custom playlist artwork, but I do know how to get the playlist description! Here's the answer in Swift 3 syntax:

let allPlaylists = MPMediaQuery.playlists().collections
let playlist = allPlaylists.first

// I dunno how to get the custom playlist artwork, 
// but you can get artwork from items in the playlist:
let artwork = playlist?.representativeItem?.artwork

// The description is here:
let description = playlist?.descriptionText