Adding to your basic figure drawing. Before shading, add the details that your want. Items such as hair, eyes, and clothing should be added. There are different ways that the eyes and hair can be drawn. You can look at different manga artists to see their style. I draw hairstyles without any reference (my own design), which I highly recommend.

I drew the details of my character before darkening the features.

Shade and add more detail. Erase the lines that you ado not want.

Another example is done below.