I just read an awesome book called The Girl Who Could Fly by Victoria Forester (2008). In it, Piper can fly and that causes problems. So she's sent to a top secret school where they promise to fix her. But Piper soon finds out that being fixed is worse than dealing with the problems she caused at home.
I highly recommend this book not only for its story but for the way the author skillfully changes the pov from one character to another.
One Myth Debunked to be Replaced by Another
Most aspiring authors who have done their homework know (I hope) that you don't need an illustrator or cover artist if you are submitting to a traditional agent. Yet some picture book writers can't help but put their entire vision on paper, complete with extensive illustration notes. I get it. If that's the only way to get that picture book on paper, indulge. But before you submit, do yourself a favor: