Some of PA's choices for album and artist art can be frustrating. For example, Album art uses artist art while album art is either the default jagged line or something irrelevant. Similarly, album art can be irrelevant or missing.
At a minimum, being to designate artist art from album art or vice versa is better than nothing. Being able to search for, and use, user selected art for the artist or album art and swap art already recognized by PA would be even better.