I love myself some Monster Hunter haha Great work! Not sure if you are still working on it but love to see the next WIP.
This might be more of a stylistic choice but I what I loved from the MH series is after slaying a monster you turn into a miniature of the monster due to the armor set.
You could add some more 'overlaps' in your outline. For example, the scales on the Rathians head overlap each other. This is what scales tend to do, fish scales, for example, do the same.
You can do the same on the back of your character. Now it's all smooth but adding the overlaps of the scales/metal parts it becomes more believable, creates a sense of reality and to gives a resemblance to the dragon itself. Same could be done on the hilt of the sword and so on.
Again, looking forward to the next WIP! Amazing work.