What is the criteria for uploading an artwork?

The current acceptable format for an artwork is a perfect square with a minimum of 3000x3000 pixels, and not blurry.
You can use stock images provided that the image you will use is royalty free.
The information in an artwork should be as simple as the Release title and/or the artist name. Information should match with your artist name and/or release title 100%
If your song is Explicit, you can add the Parental advisory label but only the official logo used by the RIAA.

Listed below are the following guidelines that is not allowed in an artwork:

Extra text that isn't in metadata
Extra logos. (Label logo is acceptable)
Copyrighted images
Having celebrities/public figures in the artwork
Social Media handles
Contact information
Cutoff images
Stretched out images, blurry images, pixelated images
QR codes, Barcodes
Movie rating labels (PG-13, R, etc.) Anything used by Motion Pictures Association
Self made Parental advisory label that is not the official logo from RIAA. (i.e. Parental advisory clean content, Parental advisory positive content, etc.)