I can only comment on the grow preview, but here goes.
From what you've shared it looks great. Plotwise it contains my most important requirement: the girl enjoys her growth (almost always included in such things, but still appreciated). I also like the idea of her knowingly cooperating and the latest previews show her getting up to a remarkably huge size, which I adore. I think overalls were a nice choice of clothing for the scene and from the previews it looks like you've taken good advantage of them.
The arts excellent, a lot more detail than I'm used to seeing. Seems on a par with anything professionally released. On my monitor the lettering looks a tad hard to read, but I think that's more my monitor than your work. Figured I'd just mention it incase anyone else has a similar situation. If not then ignore it.
Good luck with the project. And the Navigirl too.