I would be more cautious of "scripty" style typefaces for a cover, as it is harder to read. Especially considering that the thumbnail will be quite small. And type over images can be problematic.
However, of the three, I think the first would be your best choice. It is simpler, clear, and seems to fit the title better. The trick now is how to make it stand out as scripts are inherently "weaker" visually than a nice bold sans serif. Anywhere it can go, it would be crossing contrasting tones, making color choices difficult.
But then, if you want the image to carry the message, the title can be a bit more subdued. You just don't want it to seem timid and sort of tucked up there in a corner.
If you could bring the top down a little and get more of that soft pink, that could certainly work for a clean backdrop for white text. Or a subtle drop shadow to ring in the script. Even a white block could work to really set off the text if you don't mind covering some of the art.
This is a tough one, and something I would personally spend some time fiddling with. I love the image. But yes, I agree that Book 1 should be in the same typeface as your name. Script faces are delicate flowers, and should be used sparingly. Besides, the sans serif your designer chose is a really nice modern face. I loves me some sans serifs!
