This instruction only provides an exhaustive painting process of the Terminator. And also I have recorded a video on youtube: https://youtu.be/WIt7VSOrSp4 for those who have never touched model paint.
You need a 3D printer first, then you could get this model from shapetizer.com.
Step 1: The Base Primer
Evenly spray a layer of grey & white primer both on the body and the head, so the color could stains more easily.
Step 2: Spraying the Shirt
Mix white & black with a little green in the paint thinner. Then slightly spray it on the shirt layer by layer.
Step 3: Delineate the Shadow Parts With Black
Step 4: Jacket Spraying
Modulate pure black with painting thinner, cover the jacket.
Step 5: Zipper Coloring
Convex zipper is easy to paint. A fine brush draw dabs of gold on the zipper.
Step 6: Skin Painting
This can almost be the most skillful step, to imitate human skin color really cost a considerable energy. You'd spray them layer by layer(from yellow to red) to create real skin color. To mix the first layer color: white, yellow and a little red. Keep spray until the pigment runs out.
Step 7: Keep It Real
Spray the face layer by layer until it begins to show a flesh color, every layer you need more red in the mixed pigment thinner. Concave need more red pigments.
Step 8: Under Color the Metallic Face
Every metallic part painting need a black base.
Step 9: Metallic Skeleton Paint
Carefully draw a layer of silver on the raised bareness.
Step 10: Blood Stain
To create a wounded effect we need to stain some blood(darken red) on the edge of the bare metallic part.