For the neck, I would add a light shadow on either side of the esophagus and place a highlight along the esophagus. Then, I would draw thin shadow lines with corresponding highlights to create the wrinkles.
Curl your hair with a rolled up sock over night! --- "The Sock bun worked great! It gave my hair some great curls in the morning and it was comfortable to sleep in. Also, the sock bun is a cute hairstyle even when you just put it up!