Coverage
Why image coverage is uneven
Album and track art usually has better metadata than artist portraits, which is why some formats appear almost complete while others still need fallbacks.
Point 1
Chartwave uses multiple Last.fm-based fallbacks before it gives up on an image.
Point 2
Track and album art usually has stronger coverage than artist photos.
Point 3
If Last.fm does not expose a usable image, Chartwave falls back to text-forward layouts instead of broken image boxes.