In the process of making one of these for a character and I've got a couple of questions.

1) Should the image be completely grey scale or contain some colour? Most tutorials suggest gray scale though some say that colour can be included.

2) As a base colour, would you recommend very dark grey (assuming that those most areas will have very little specularity)?

3) In the few practice runs I've had, they don't look quite right - something about the colour. Does the specular colour come predominately from the colour of the map, or the light hitting it?

Thanks again,

gubar