Map only partially applies to a model

Hi everyone. I have this problem:

I noticed before that when I chose the “Smooth” option from the Mesh panel, there were ridges where the black and white in the above image meet. The portion of the head that is black (the face itself and the ears, separately) were appended from another file, which I then linked (Ctrl+J) and connected to the rest of the model; but I don’t know why the ankles have this problem, too. Now my UV map is only applying to these appended areas and the ankles, as well.

How do I fix this?

Edit mode, select all, W -> remove doubles and look at the top right header for information, it shows if it removes anything. If it does, you probably have to unwrap again.
Also, select all, ctrl+N to recalculate normals (outside).

If simple recalculate normals (Ctrl-N in edit mode with all mesh selected) does not help - check for doubles, errors and such.

That solved the problem. Cheers. :slight_smile: