Not too much left to go, at any rate. Down to all but the last page!
Page 21 is a good example of something I would change if this were to move to an actual book format. Currently, it's 22 pages (which allows me another 2 for title page, or, in other words, a 24-page book. All books have to be in multiples of 4, because of the way they are printed). A typical picture book is 32 pages, so I'd need to add another 10 to fill it out. Which is why I'd change page 21 – I could easily break that into 2 pages, if I weren't concerned about finishing this before Arianna is too old to appreciate it (say, at 2 and 3/4 years old. Hey wait, she's narrowing in on that now!). The transformation could be one page, and his explanation the next.
Other places to split pages would be when she answers the door. If I weren't trying to keep the current page count down, I'd have made that it's own page. I could also make Princess Moy Moy's first appearance in the garden a two-page spread, as another example, as well as her running back with the golden ball. But all of that is just a future possibility, I've got a child to hurry up and read to!
P.S. On my screen, it looks like the Prince has a yellow front to his shirt (i.e. the same color as the frog's belly). On Serena's screen, it looks like his shirt has a neckline that goes all the way down to his waist (she said all he was missing was chest hair). How does this look for other people? Should I make it more decidedly different from his skin tone, or does it look okay?