I do apologize for being late with judging April's screenshots but lets see...
The winner for April is...Nyctaeus

I love the ominous feeling that accompanies this picture. Like, you know something is or went wrong but you can't quite put your finger on it.
Some honorable mentions:
MatththeGeek:

Solaris has amazing screenshot potential and I'd love to see more. Darius did an amazing job putting together that mod. I will admit, I have yet to play it, but I absolutely appreciate the work he's done nonetheless.
TechnoD11:

The Tev Blitz on Earth gave me mixed feelings in Blueplanet. But the screenshot, however, did not. I love the positioning of the Indus and Vatican when they engage the Diomedes who's name I've totally forgotten because they're that worthless. The starfield and Earth are just perfectly placed. It's an amazing screenshot and worthy of praise.
tomimaki:

The new Ganymede and Hecate model work a little too well together. It's almost as if FSU team is trying to send a message... The color pallet and background (or lack thereof) work well together. My only gripe (and this is my perfectionist talking) is the camera position. Very nicely done, keep it up!
Colt:

This is my runner up for the "pictures that make me feel uneasy" category. The nebula barely masking the Knossos gives you a sense of dread seeing as we know what could lie on the otherside. My only complaint would be the color of the star and the color of the nebula. But I love the theme and camera positioning, it really gives off similar vibes as Nyctaeus' winner screenshot. Keep it up!
May's theme will be First Responders, in recognition of the frontline workers battling our generation's Spanish Flu: COVID-19. More details will be in the thread.