With those initial pencil lines gone, add a bit more detail to his Mohawk and draw some warts along his chin. Dex has quite a textured skin surface so feel free to give him as many blemishes as you want!
you're done, erase the stray marks you don't want. Have you tried gum erasers? They work better than the eraser on that No. 2 pencil you may still be using and you can buy them at any art store.
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