Auth Screen

Real pixels: http://cloud.arturgrigor.me/image/3P2D122n3A24

I'm currently working on a utility iOS app that's inspecting some things. Because it's a simple app, I've decided to go for a simple and clean UI.

Here's the Authentication Screen. What do you think of it?

P.S.: I've decided to make the icon very subtle because I realized that the user's eyes were focused on the icon instead of the PIN & the keyboard.

Don't forget to press L :). Thank you!