Good use of color! You're definitely on track for capturing the overall sense of the piece. But maybe you're a little dissatisfied with how it looks--it doesn't quite match the reference, does it?
I'd recommend measuring more. Choose an object in your scene and use it as a "measuring stick" for the rest of the scene to correct mistakes. You could use the rearview mirror in the car scene, or the chair in the bedroom scene, for example. If you've got a decent idea of how large that object is, you can say, "okay, so the chair is this wide, and the desk is about two chairs wide. How many chair widths is it from the chair to the bed? Is everything in proper proportion to everything else?"
Measuring keeps everything in its proper place and makes your illustrations look more accurate. I think this might really help cement in your paintings! Good luck!
