Well, here was my write-up for it. TJ said this is what they're going with so...
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Okay, so, image 1 we've got Circine reading the book as Sonya looks on, looks like Jo and Sam are discussing something off to the side. Perhaps Circine turned up the book in some weird little store in the mall she'd never seen before that professed to sell magic. Sonya's curious, while Jo and Sam are scoffing at her gullibility.
I can see their relative heights but I don't know their starting numbers, so I'm just going to have to make guesses. Feel free to have him adjust accordingly.
HEIGHTS:
JO: 5'7"
SAM/CIRCINE: 5'2"
JENNY: 5'8"
SONYA: 5'4"
Image 2, they've all started shrinking but Jo. Circine and Sonya are still too engrossed in the book to notice right away, despite their clothes starting to slip. Jenny is definitely noticing, but confused. Jo seems to realize that SOMETHING is off, but hasn't quite hit panic mode because she doesn't realize what it is. Sam is evidently pretty sure what it is, and is amused by it.
HEIGHTS:
JO: 5'
SAM/JENNY: 5'2"
CIRCINE: 4'2"
SONYA: 4'8"
Image 3, Circine and Sonya both panic as the book becomes too big and heavy to hold up, falling down and drawing their attention to their clothes dropping off of them. Their bottoms have already hit the floor, leaving sagging panties sliding down their legs as tops drape and droop loosely. Jenny is desperately clutching her sagging outfit, staring down at herself as she wonders what's happening. Jo's clothes are slipping as she looks shocked/panicked; Sam is teasingly holding her hand over Jo's head, making fun of her shrinking even as she's starting to dwindle herself.
HEIGHTS:
JO: 4'
SAM: 4'8"
JENNY: 3'8
CIRCINE: 2'6"
SONYA: 3'
Image 4, Circine is staring open-mouthed at the huge spellbook on the floor in front of her; she's too in shock to cover herself, leaving her giant shirt hanging off of her and exposing her body. Sonya is looking rapidly back and forth between Circine and the book, her clothes in a puddle at her feet and her hands covering her body. Jenny is holding her giant shirt against her and staring up at the enormous room in awe. In a sudden reversal of fortune, Sam shrank faster near the end, and is now the smallest girl; she's looking up at Jo, the amused expression replaced with one of shock. One hand is between her legs, covering her bare crotch. Jo is smirking down at Sam while clutching her giant clothes to herself, though she doesn't notice one breast is exposed.
HEIGHTS:
JO: 2'6"
SAM: 1'
JENNY: 2'2"
CIRCINE: 1'6"
SONYA: 1'10"