Got a message about your album art? Here's what you should check on your art.
Is your image and / or text blurry?
Your image should be clear, crisp and readable.
Is your art stretched or warped (in a non-artistic way)?
Is there excessive blank space?
Is your art generally low-quality?
It's always best to put your best effort into your art. Remember, your release is being sent to retail stores. Make sure that your product is something stores would want to sell!
Is your art blank?
Art should have some visual interest like an image, your album title, your artist name, etc.
All that said, here are some examples of acceptable art
Clear Text / Clear Image
Do you need THE BEST, professionally designed art? Of course not! A clear image with clear text just like this will do just fine
Intentional Shallow Focus
While some of the elements of this photo are blurred, it's clear by the clear text and clear forefront focus that this image is high quality and intentionally shallow focused
There is some blank border here, but it is evenly spaced and the image is centered
There's not a whole lot going on with this art, but the text is clear and is intentionally placed.