What age are you now? You kind of remind me of when I was drawing at 11 and 12 years old. You have a great talent in coloring and lighting, but it isn't exactly placed correctly in some pieces. Just watch out for that, I wouldn't be too worried. Anyway you need to work on your 3d effects and some line work. Some of the figures aren't correctly placed in the way the rest of the art is.
Overall, work a little bit more on your line work. Try drawing more singular objects and work on anatomy and such and you will be flawless. I tell you this because as I have, you will get a lot of job opportunities in the future if your good at many genres and objects.
good artwork, keep it up