Hello Arthurv!
You have a good sense of gesture in your characters that makes them look lifelike and not stiff, as shown with the piece with Zelda. Also I like how you exaggerated the characters expressions, it is very eye catching. The tonal piece at the end is very striking, if you do more tonal piece your comprehension of shapes will improve also.
Where you are going wrong is the proportions. The legs look too short for the body in the Zelda piece as well as the character with purple hair. In my opinion, if you studied more on proportions it would make your characters look more appealing.
- Ash