I've noticed that some artists draw a lot of charas that look like them. It isn't bad at all. One example of that type of artist is MincedNiku on DeviantArt, 'cept it's his style that looks like him, not just a few of his charas.

Wooah, awesome! x3 I love the shading! And his expression as well. You're really good! =3 Keep it up! ^.^ ♥Darkhuntress