The cover art is one of the most common reasons to not have the uploaded product accepted from the start. Let's go through the easy mistakes to avoid.
Images must not be blurry or pixelated. There can't be any quality issues like misalignments, rotated images, or have other quality issues.
Text on the cover
The only text allowed on the cover is text from the release. That is basically only the artist and collaborators, title and label. Also the spelling must be the same!
So, if you include the artist name and name of the release on the artwork these must match exactly with what it says on the release, spelling and otherwise.
If you write a featured artist on the cover, it must be clear who the feature and who the primary is (the primary artist comes before the featured).
We prefer it if you don't credit the program that was used but if you really want to you could mention the creator of the artwork (deigned by Awesome). As long as it doesn't become advertisement, or if there are websites added.
The simple rule is to not put too much info on the album cover.
The cover art needs to a square of at least 1400x1400pxl (and max 6000x6000pixels) and in good quality.
If you succeed to upload the cover art it ensures most of the file criteria are ok so the most likely reason if it would be rejected is that the artwork has text or logos that are not allowed.
What it may NOT include
No websites or social media handles.
No references to physical packaging like a CD logo, nor to a digital product.
No brands nor advertising.
No images from other copyright holders are allowed without written permission.
No year nor dates.
No Store Names nor special offers.
No tilted images.
Pay attention to the quality of your picture - your song really deserves to be marketed together with a high resolution picture. The more pixels the better and an absolute minimum is 1400 x 1400pixels.
Cover art is still an important part of presenting yourself as an artist even though it has changed over the years from the fold-out vinyl to the small digital icon of today. Take some time and think about how you want to portray yourself as an artist. Match the art with the kind of music you’re delivering.
There are plenty of good websites for making your own professional looking artwork and you'll find them if searching for "make album art".
The cover art is important - go the extra mile! It matters!