Always wear goggles and a nose and mouth mask when using a Dremel to sculpt and shape the body. A Dremel is a power tool that should be used with absolute care so as to not hurt yourself. Also, using a Dremel homelanders creates lots of hazardous dust and chunks of hot plastic that can easily and unexpectedly fly into your eyes.
The next step is to prepare the head of your action figure. You may possibly use the head from another action figure that more closely resembles your conceptualized drawing. Simply pop off the old head and replace it with the new head. Naturally, you will want to thoroughly clean the new head so that it will be ready to accept add-ons and paint, as well.
Run hot water over the head for 30 to 60 seconds as you did with the base body to help make it softer and more pliable. Remove unwanted hair or other adornments so that you have a stripped-down base head with which to work. Have your tools of choice handy: pliers, wire cutters, an X-acto knife, and a Dremel power tool. Be extra careful to not cut or harm yourself as you modify the body with the tools.