Creativity is a key element when we talk about character design, and in this post you have many examples of how to create a quality character that will leave you speechless.
From my point of view the most important things when making an illustration of this type are three: that the character has "life", that the features are correctly marked and that he transmits some kind of feeling.
There are many styles of drawing, many different techniques and various ways to get there, but the most important thing without a doubt is to achieve a great final product.
Source | Vandelay
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