Ok I'm a begginer so if you have some heads up, i'm all ears
Cruel to be kind.
At the moment it resembles a face, nobody's face in particular, sorry.
You need to sort out the upper width of the head, the jaw line angle and depth.
The brow line and upper eyelid needs more meat (see pic).
The left side of his mouth looks like he has an absess.
I could go on.
Your best bet is to get a few images of depp out of character.
Draw a grid over a few of these images (say 4x6) and then study what you see in each individual box.
Sculpt depp first, then just throw a wig and a goatie on and you'll have Jack.:thumbsup