Speaking of card layouts, one suggestion for the card text for monsters. Take the Harpy for example. On the card it says:
Before the encounter, all characters must make a Wisdom 8 check; ... etc.
My first question when reading the card was "Why?"
It became clear when looking at the bestiary and the special abilities of the monster.
So the card text could read:
Captivating Song: Before the encounter, all characters must make a Wisdom 8 check;...etc.
Would give the card a little bit of flavor without taking up too much space.