Movie Poster | Hasta Luego

So, this is my first time creating an actual movie poster. The outline of the two girls are actually hand drawn. I had to draw this with a pencil before outlining it with a thick watercolor (you can see my amateur side appearing lol) pen. Then I scanned the drawing and lined it once again with the pen tool. It's pretty tiring, but the results are kind of satisfying. (: Let me know what you guys think!

Also, I have a question: I've read in a website that when it comes to movie poster credits, the text had to be 25% and no less of the title's size. Does that rule apply per line or does the whole length/height of the movie credits have to be 25%? Please do help by answering if any of you guys do know about this, since I need more space below the title for more text to be added.