Op, if you're serious about art you're off to a good start since you have good line art and you can shade with a pencil decently. I'd suggest you expand your skill set and draw entire bodies of characters with gestures, try not to avoid hands since a lot of new artists do that and also try mastering color value because it breathes life into art.
Actually that's why I do mostly faces I suck at hands it's the one thing I'm not comfortable with yet to show
It's every artist's worst nightmare. And cats and horses. A great artist once told me "once you draw hands, you can draw anything" so keep drawing hands.
Op also I would advise getting a sketchbook. They have them cheap at Walmart. I just ordered me a set of graphite pencils to enhance my shading on my own personal drawings
Me personally I like drawing faces, so i draw faces and other stuff in my sketch book and redraw them using a sketchbook app on pc so they are a digital drawing So experiment and mix and match art is a wonderful thing and if your good you can make money from it
I know they are cheap but I don't know I was one of those people that started drawing on line paper when I was in elementary school and I just kinda stuck with it