Looking over my topcoat challenge pics, I realised I was not happy with the method I used to test. So I'm going to do it all over again, in a slightly different manner.
Instead of applying a different topcoat over each finger, I'm just going to apply a different topcoat each time I do my nails, and take pictures of how they wear over the course of the next few days. This should better show which topcoat works best on my nails. I'll re-score the polishes based on application, smell, finish, and lasting power.
In the meantime, here's a random picture of a Claire's polish I picked up this weekend: This is Night Sky, a holographic and navy blue glitter in a clear base. It's absolutely beautiful, and cheap! It's also sold as Icing Epic Winning. I used it for a glitter gradient on top of OPI Princesses Rule! I have Deborah Lippmann's Candy Shop on my middle finger, and China Glaze Wicked Style + Konad special white polish dots on my pinky, in case anyone's curious :)