I'm having an issue with the Picture Gauge. I finally got everything working and it falls when the enemy takes damage, unfortunately it doesn't sync up with the enemy's hp.
The gauge doesn't fall enough when the enemy has >50% health, once the enemy has exactly 50% health then the gauge is perfectly in sync, but <50% health it starts to become off again.
When an enemy with 20 HP hits 2 remaining HP, the gauge shows empty.