Yes, I do book cover design too. This book hasn't been written yet, so get on it and let me know when you're ready. You need to come up with a tagline for it too. Something sinister and foreboding like 'lights out' or 'you had better keep you curtains closed' but less obvious and clichéd. The Blackout Warden: Tonight the falling bombs are the least of your worries. Maybe it's not that kind of horror at all, but about a lonely protagonist who has to witness the horrors of war and suffer alone as they try to keep the town invisible. I don't know. I've done the hard part, you've just got to write it. I've gone for dark, low-contrast, atmospheric and minimal design to make the illuminated window really stand out.