I have looked at your stills and the video. Your scenes are too uniformly lit. You need to use light in such a way as to make the foreground character pop out from the background behind it.
Learn about 3 point lighting technique to get better much better shadows, silhouettes and contrast on your virtual actors:
This VIDEO shows nicely how to set up 3 Point lighting on a character:
Literally every one of your scenes would look far better if you had one extra white spot or omni light with strong shadow coming at the character from the left, the right, from above, from below or from somewhere behind (over the shoulder).
You can try placing a light next to a character and orbiting it around the character until you get lighting that is dramatic - the light itself will be invisible in the render, so you can place it pretty much anywhere.
Great looking characters in you scenes - just light more dramatically and cinematically.
Also use some color/contrast correction software.
You may also want to look at some videos or photos of how professional cinematographers position lights on a real film set.