Along with Omar’s suggestions, I’ll bet your head isn’t as far off as it seems in the images. Light your head the same as the reference and it’ll look much closer.
But the problem you’re describing is common with folks trying to “xerox” a reference. This is why I gave the method up, especially for real likeness (I like to do it for stylized). Because when you matches facial landmarks so well, as you’ve done, but you stand back and it still doesn’t look right – what more can you do? Though perhaps unintuitive, I’ve found that developing my eye by avoiding xeroxing has made my likeness sculpts better.