I rarely critique 3d work because I haven't studied it myself- I don't know how to tell you to use it to make your images more realistic. On a compositional level, you might want to play with dead-centering your subjects a bit less, but generally you're doing great.
However, critiquing (subjectively) on subject matter alone, all your works are essentially still lives. Objects in a simple setting not really interacting with each other, not telling stories, not conveying emotional messages. They convey a high level of technical skill (inasmuch as I understand 3d art), but I for one am bored by them.