The truck looks like a good start,but something is missing. Not quite sure what it is. The yellow is really saturated, which is getting blown out. Otherwise, good start.
The day scene is nicely lit, but white makes things feel clinical and boring. Try something more yellow-orange and see how that changes the mood of the scene. Similar idea with the night scene.
I also suggest changing the background color to something other than black to better fit the whole idea of this image. It could be a blue sky through that window. Overall, good work, but there’s plenty to learn.
