Use your Xacto to remove the seam lines from the arm portions of the casting in the same manner as you removed them from the head. 

Don't do the fingers at this point.
Check the opening in the arm.  Is it clear of jagged edges, and is the opening large enough to accept a chenille stem when you assemble your doll??? Remember, that hole will be 20% smaller after firing....
Use your nylon bristled brush to sand the seam areas smooth.
Smooth the arm areas with a nylon stocking over your finger.
Have an area that is difficult to reach?  Hold one end of the stocking between the thumb and middle finger, and extend the index finger out with the nylon stretched over it, pulling the nylon out to a thin flat edge, and sand.
Use your finger tool to clean seamlines from fingers, and to deepen and define, or even separate the fingers.  This step requires a steady hand, a light touch, and lots of patience.  Don't rush, it takes much longer to re-attach a broken finger than it does to take care in cleaning your hands.
You may also choose to define the fingernails with the finger tool.  Don't do harsh outlines of the nails, as they tend to look harsh when painted.
Dip your 10/0 spotter brush in water, blot on a paper towel and gently smooth between and around the fingers.  Don't use too much water, or you will quickly find you have a fingerless hand.
Don't forget to detail the underside of the hand too.  Clean between fingers, inscribe joints in fingers, even deepen palm lines if you wish.
Smooth the palm and back of hand with a small flat nylon bristled brush.
Dip your 10/0 spotter brush into water, and smooth between and around all fingers.
Use your china mop to remove any loose dust from the 

Use scalpel to remove seam lines.  When cleaning a leg with stockings, the seam will probably run right over the socks.  Remove the line without disturbing the lines that indicate the ribbing.  If some of the ribbing is removed, you can replace it later.
Sand seams with nylon bristle brush.  Don't over clean on stockings or details such as buttons, bows, etc that might be on your shoes.  
If you need to replace ribbing in a stocking, use a ball stylus tool,  It will make a much softer cut than a finger tool or X-Acto knife.
Check the end of the casting and make sure that the opening is adequate for the insertion of a chenille stem after firing.  Use a damp cat's tongue to smooth the inside of the opening to prevent cracking in the firing.
Give your legs a final inspection and polishing with your nylon stocking.
Gently remove all loose dust from casting with your china mop.

Tools and Materials

Duncan EZ Stroke Underglaze

Ceramic Tile

Food Coloring

Palette Knife

Clean Water

10/0 Spotter Brush
Place a small amount of one stroke underglaze on a ceramic tile.  Add a small amount of water, and even smaller amount of blue food coloring to the tile.
Use your palette knife to mix the glaze, water and food coloring thoroughly.

The food coloring will make it much easier to see where you have applied the glaze, since uncolored, it tends to blend right in with the white greenware.
Use a 10/0 spotter.  Dip the brush in plain water, then blot excess water from brush onto a paper towel.  Moisten the eye area with this brush.  The application of the water will help prevent the greenware from "grabbing" the underglaze too quickly, which would prevent you from applying it smoothly and thinly.
Place a small amount of underglaze mixture on your brush and very carefully apply to your eye area.  If you make a mistake and get some of the glaze outside the desired area, let it set up, and gently remove with your scalpel, then re-smooth that area.

The underglaze should be applied in a single coat, as smoothly and evenly as possible.  During the firing, your greenware shrinks 20%.  The underglaze really has no place to go, and will shrink up too, but if applied too heavily, will become very rough in the firing.
Teeth can be underglazed in the same manner.  Dampen first, then apply underglaze

Note:  If you want a gloss finish on your teeth, or even your eyes, you should substitute Seeley's Perfect Pearls for the Duncan underglaze product, thinning, tinting and applying in the same manner.  Perfect Pearls is a combination of white underglaze and clear high gloss glaze.
If you are going to china paint socks or even shoes in a pale color, and have cast your legs in a flesh tone porcelain slip, you can apply the underglaze mixture (matte finish) to these areas as well.  It will mask the pink color, and give you a white background to apply your china paints to.
Application of underglaze to Dorothy's ankle socks.  Notice that the underglaze is applied thinly so that the ribbing in the socks is not filled in.
One last time, dust off ALL of your castings immediately before placing on the kiln shelf.
Cleaned castings on kiln shelf.  I use a thin layer of firing sand under my pieces in my cone 6 firings.  I keep one shelf with sand ready for firings, and use a clean shelf with no sand or kiln wash for my china paint firings.  

Note, this picture is just for illustration purposes.  I promise you that when I fire my kiln, I make sure that all of the shelves are completely loaded, and schedule my firings to run full loads to conserve energy!!!

Well, that's all there is to it!  I hope that you have found this tutorial helpful, and will visit again for new tutorials which are being added regularly.  For instructions on assembly, china painting, costuming and even hat making, visit the tutorial index.  Happy Doll Making!