Too light, perhaps? Not enough darkness in the shadows?
You're lucky and clever with those figures. Perfect placement.
Your instinct is correct, IMO. Darker overall and more contrast would be my wish.
Also, I'd lose the narrow light band across the very bottom RHS.
And I'd crop or significantly darken the upper 20% of the sky just above the dark band on the right.
And probably I'd clone out the jet contrail.
THEN it'd go on my wall : )