Well, it probably depends on your teacher. But yes, I would say, at least in my high school, art was a joke, with a lot of coddled feelings and "everyone's art is perfect" covering up mistakes.
Traditional paints are good to learn, if only because you learn to work with colors more than in digital art. In digital art, it's very easy to say "Oh, this needs to be a bit lighter or darker, and add light or black." And that leads to muddy pieces. Traditional painting doesn't have literally glowing medium, so white isn't nearly as powerful and learning to use color theory and saturation contrast helps a lot more.
That being said, your pieces, both digital and traditional, are very clean and lovely. I especially like your self-portrait. Keep up the good work!