I believe you draw in the same way as you do when you use a computer. How about changing a bit and adding some shadows with pen? There are great pendrawings in this community. Did you notice that? It is good to learn from others. So try to visit a few and share your ideas, opinion so everyone can learn from each other. It's also a good way to promote yourself.
From now on, I will look at other people's sketch art and share it. Thank you for your kind feedback.