Great portraits @danilo_tedde, I esp like Nezuko. One thing I noticed about the 2nd portrait however is the right eye looks a little off. To me eye is too forward, it needs to be pushed back in a tiny bit it, it gives the feeling that the eye is surface level with the face instead of in a socket if you know what I mean. See below.
Other than this looks great, you have a really good understanding of values, I’m esp a big fan of your landscapes love it!