The Name of the Star by Maureen Johnson
The Silver Blade by Sally Gardner
Shadowman by Erin Kellison
Here is another interesting one, B + C = A basically! While Shadowman isn't an exact match it's very similar to the girl on The Name of the Star. My vote instantly goes to The Silver Blade. The other two have too much going on for me and have a mixed bag of elements on their covers that make me stop and go "Huh?"
Have you spotted a Lookalike you would like to contribute? Send me an email!