Experimental Process

 

At first, I sketch and block in the form. I try to make sure the silhouette looks good. The overall silhouette should be composed of smaller silhouettes representing individual parts. These smaller silhouettes should look good by themselves. A silhouette may look good as a whole, but if a smaller part does not look good, it will ruin the whole piece.

There is this general rule that I must follow for consistent shading I've learned of the method via a book on rendering and lighting. You should also read books.