Now that you have the foundation of painting, you can gradually improve it. Twenty years old is nothing. At the age of 30, I am still a beginner. Age is not a problem!
Actually, it's not impossible to study outside, but think about it carefully. How many real things can a teacher learn by teaching dozens of students? !
And in the final analysis, the venue, rent, personnel, and other people's study classes will definitely not be less! I haven't said how it works yet.
Personal experience, I suggest looking for online teaching. At the same time, I should buy a hand-drawn board and invest the necessary energy and time.
A few years ago, I was looking for an online illustrator.
For example, Baidu: "Night Wind Illustration", "Sunny Painting" and other online one-on-one learning. Is the effect good? It doesn't matter what I say. Anyway, now I am drawing with my friends in the game company, and I feel that what I learned before is very practical and worthwhile!
-Personal suggestions for your reference!