Cats are creatures of the night so fit a darkness theme well. The composition and image quality are good. It is properly exposed. You've captured the cat's eyes particularly well.
Though they should not, some voters may mistake this for a "pet picture" and mistakenly score it lower.
On the technical side you might have considered having equal lighting on both eyes. Generally speaking that would work better for most reviewers and give it better balance. The light patch on the lower right of the image is a distraction that should be removed. Curiously, it almost looks as though the cat has no mouth.
I love this prowler! It's a beautiful shot of a beautiful cat, who's looking suspicious enough to warrant the dark background. Great composition; the off-center adds to the tension.