All quotes taken straight from Howl's Moving Castle by Diana Wynne Jones, God rest her soul.
This book has more awesome lines in it than any other children's book I know. If you've only watched the movie, you are missing out big time.
I love how in the book, you can always tell how honest Howl is by his hair color. There is literally a whole emotional arc tied to the state of his hairdo -- that's just how this book rolls.
So: Tinted, immaculate hair == he's lying / hiding. Messy bird's nest == HE LOVES YOU. For serious!
No, the last picture doesn't happen in the book, either, but I imagine that by the time they get around to it, Sophie will have convinced Howl to show her his real hair color.
And hey, they have a baby in the sequel so this isn't speculation so much as ... picturing their off-camera exploits =3
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EDIT: The lovely ~minutia-r has written a superb companion story to this piece, which can be found HERE. It is so perfectly Sophie and Howl. *melts* Go read it
;( I so respect Diana, great, great author! She magicly could find everything that I wish I could read in a book and was writing it...Respect for the picture too <3
Man, this is by far one of the most fabulous version of Book!Howl and Sophie I've ever seen!