I love these compositions, and don't want to impose by giving my suggestions, because I might not be at a level to properly critique you. However, a trick I do with all of my art is that I run it through a photo filter, such as snapseed, and see if my values are working, as well as see if the filters somewhat suggest textures I could use, as well as show me where things would look better darker or not. Here is what they looked like after the filter.

Notice how the texture really brings the piece together, as well as the contrast from the show behind the door could be a great place to highlight the light/dark distinction.

The second image I saw thqt the cat's face was the same value as the background, and no matter what filter I flipped to, it could contrast the characters face from the background.
So those are my thoughts. I think the compositions are great, and just a little adjustment really knocks it out of the park.
Hope I didn't overstep with my two cents 