I'm not sure how useful this information can be, but -
The red bar represents combat stats; top one is offense, lower one is defense.
The green bar represents athletic stats; top one is muscular strength, lower one is limberness/flexibility.
The blue bar represents mental stats; the top one is probably thought and the bottom one is probably imagination, but I'm not sure exactly.
The yellow bar represents emotive stats; the top one is kindness and the bottom one is probably expressiveness, but I'm not sure exactly.
The white bar represents purity stats; the top one is purity and the bottom one is shame.
I hypothesize that the photoshoot sequence requires you to work shame down, aside from any other requirements like how the third photoshoot needs a flexible/limber body. You don't need to H her to work shame down if you buy the porn book from the shop, and you can always grind purity stats back up using the manga, the encyclopedia or the flower.
By the way, if you have high purity stats (like 99 purity and 30+ shame or so?) you can beat the slime without a fight by choosing to go unarmed.