I agree with everyone saying the female's face looks a bit weird. I personally think it's just the eyebrows that throw me off. I'd make them a little bit darker.
The font used is great. Don't listen to anyone telling you to change it. It makes me feel like I'm reading a handwritten story, and I personally feel handwritten things have a lot more emotion put into them. Only thing is I'd just make the font size bigger in the prologue. It is a bit difficult to read certain words. You wouldn't want your readers to have to stop every so often just because they can't read certain words. Distracts them from the story
The font size you use for the chapters is fine though.
As for some music suggestions, you really can't go wrong with any song by Yiruma. It fits the same style of the one song that loops over and over again. Some of my favorites:
I don't want to make any changes to your story, since after all, it's YOUR story. Everything should be how YOU want to portray it, not me. Me telling you what to do would just take away from the beauty of how it was originally supposed to be.
Other than that, everything else is great ! Nice job