I am only going to read the top one you listed.
You have definitely written yourself a strong and polished introduction. You properly introduced the fantastical races that are so popular that you don't need to explain what they're like. It's quite dense with political strife as well.
The content your introduction provides properly lays down the foundation of your story. Just nurture the rest of your story with the same love and care and you may find yourself at the cusp of making a story that will bring in many readers to your doorstep.
Though I have to say, I cannot personally mesh well with the main character. He's incredibly distant, I cannot relate to him or his story. It's probably the consistently angsty tone he produces. He likes to point out all the vices that humans have while he has those exact same vices himself. He sees himself as above humans even though he seems to simply rely on the powers he is given simply for being a dragon. Even with those powers, he was still defeated by a human. I'm not sure how lowly he sees humans. But if he sees them like how we see ants (Not the dangerous ants). Being weakened is no excuse.
Without those powers, he is just as vain as the humans he looks down upon. This opinion of mine is further reinforced during the time his powers were sealed and his soul was pulled into a human-like body. As much as he patronizes humans, it seems that even he bows down to the monarchal systems that the humans put in place.
Honestly, my only major complaint is the main character. The other characters are purposely undeveloped to give most of the spotlight to the main character but since I can't really relate to him nor like him as a character. I don't really care.
Overall Opinions:
+ Solid World-Building
+ Intriguing Politics
+ Strong Fantasy Groundwork
+ Works well as an introduction
+ Comprehensible
+ Strong sense of formatting
-- The Main Character is too angsty and unlikable
I have a feeling he is going to undergo some major character development in the future. Not that it's going to make his future any better considering the beginning disclaimer hahaha.
Also, thank you for the review you provided for me. I 100% agree with everything you brought up. I will use your critique to improve my work and grow as a writer. I hope mine can do the same for you.
Anyhow, I wish you the best of luck in your creative journey.