This shows an artist's visualization of a very youthful Bella and Jacob in Jacob's garage. You can read about that in New Moon (The Twilight Saga, Book 2).

This second one shows Jacob carving a bracelet charm for Bella...

There were frequent references to Jacob's growth spurts in the series. I guess this picture was supposed to depict that change.

I found this final picture in Hannah Carnero's Flickr page. I thought this one was extremely cute yet very touching, reminding me of the strange tenderness that Jacob (in his wolf form) managed to exhibit while he was with Bella.

Notice the size of the wolf compared to the girl in this piece? If you read New Moon or Eclipse, you'd know why he's so huge.