Apple's cover art requirements
Apple have their own requirements that you need to be aware of if you intend to distribute to the Apple Music DSP:
Accuracy. Deliver the album’s original cover art whenever possible, and don’t use generic art templates. Don’t use art that doesn’t match the album you’re delivering.
Quality. Images must not be blurry, pixelated, mismatched, misaligned, rotated, incorrect, or have other quality issues.
Competitors. Art must not contain website addresses, logos, or any other reference to competitors of Apple Music and iTunes.
“iTunes” or “Apple Inc.” Art must not contain the words “iTunes” or “Apple Inc.”
Apple Logo or the Term “Exclusive.” Art must not contain the Apple logo or the term “Exclusive” or "Limited Edition" without prior authorization from Apple.
References to Physical Packaging or Retailers. Art must not include references to the physical packaging (for example, CD or cassette) or any other retailers.
Digital Product. Art must not include references to it being a digital product.
Pricing. The art must not include references to pricing, including “Reduced Price,” “Low Price,” “Available for $9.99,” or “For Promo Use.”
Pornography. Art must not contain pornography or a URL for a website that contains or links to pornography.
Up-selling. The art must not up-sell to another product.
Misleading. The art must not be misleading (for example, prominently depicting or referencing an artist even though the artist does not perform on the album).
Missing Content. Art must not contain references to content that the album doesn't contain, such as “included DVD” or “includes lyrics.”