Even though the scanner washed a lot of this out (I know how irritating scanners can be, and you can try to turn the brightness down on it to help), I can see the texture well enough to say you're doing amazingly well. On the neck I can see your mixed stippling style convey the rough almost scaley texture of the skin. Did you work from a screenshot or your imagination? I would really suggest not using lined paper however and perhaps draw out your entire concept before you begin texture and shading. It will be much easier to accomplish what you desire in the future.