I can remember when I was a university student at art university, one of the masters told me if you want to be an artist never ever stop drawing...it makes your mind tidy...it keeps you an artist....
The day you stop drawing be sure you will stop being an artist . . .
I asked: Do I have to practice drawing by pencil?!
He answered: noooo you can practice it by anything, chalk, colored pencil, acrylic, etc
Here is my practice via acrylic on cardboard