We currently always use the 10-image collage when we display collages on artist pages (the 4 albums per row + grid layout 3 option in the art creator).

Even quite popular artists (esp. if they are album and not single focussed) often won't have that many releases, making the graphic look broken or just a bit naff:

When there are less releases (or, ideally, releases with artwork, if we can check for that?) we should default to the appropriate type of collage.

e.g.

13+: 4 per row + grid 2*
10+: 4 per row + grid 3
9: 3 per row + grid 1
8: 4 per row + grid 4
6+: 3 per row + grid 3
4+: 2 per row + grid 1
1+: just show the top album cover

*maybe this is too busy, could just stick with the current one for 10+