I just learned to draw cartoon characters like you, but it has been several months.

This does not need to be studied outside. The landlord can find his favorite cartoon characters to copy, and of course, don't print them.

Imitate whatever style you like, and over time you will form your own good painting style. Proportion or something, just look comfortable. Can you say that other people's paintings are deformed just because you don't like their painting style?

It doesn't take long to learn. Find a comic magazine and start copying. When you draw a picture that is almost the same as that in the book, you have a great sense of accomplishment. Time must be completed within one week.