Pattern Design for Girl's Top

Here's one example of how my design process starts. With a drawing like this.

I liked the blue top I made for this outfit so, using the same basic pattern, I want to make this top longer with an insert. I'm thinking about using either some kind of lace or decorative thing or maybe a contrast fabric.
My plan is to make some capri pants to go along and I'm thinking of using a ruffle at the hem, so it may be the same fabric on the ruffle and the insert. Check back to see how this project is coming along.