Like a musician practices, so should the artist. If you want to become proficient at your art, then you must pay for proficiency with hard work. Do your work.
Practice shading drills in your drawing notebook often. Practice daily if possible. Practice with both ink and pencil. Use a fine point ink pen or a pen with a fine nib. Below are several examples of what I want you to do.
Donna Young's Dragon Drawing from 1977
Use various shading techniques to give this "dragon in clouds" drawing texture and depth. Or, draw something like this yourself and add texture and depth using the shading techniques. Click here to see the original drawing.
Make a fancy calendar