is it good to master one drawing style or learn to draw as many styles as possible? Do you have any professional opinion on this? and how this habit may influence an artist?

It’s best to do what you love. If you want to master several styles and ways of doing things, that would be good, since it would increase the amount of “tools” in your toolbox…but you shouldn’t force yourself to if that’s gonna make you unhappy or stressed out. At the end of the day doing art isn’t just about getting as skilled as possible…it’s about having as much fun and making as many friends as you possibly can through the medium you love! If it’s not serving that purpose, then why the heck are we doing something as arduous (and frankly tedious) as art?

Bottom line, there are some artists out there that have done a single style all their lives and made a great living off it…and there are others that can flip-flop between styles like they change clothes, and are struggling to make ends meet. It’s all about personal preference and ability.