dont resize your base skin texture , that will give you defects that you dont want. Because of the interpolation of the texture as its resized.

use the skin texture as the base layer and load and resize the MAKEUP to fit the base skin texture.

If it doesnt line up easily contact the vendor for some decent instructions, you shouldnt have to chase after tutorials to use a store product.

You need help in overlaying two textures in your paint program, since the paint forums wont help you youseem to be  on your own .