Nice rendering, well done. If you wanted to improve it, you could look at pushing the highlights across the upper 'lip', tip of the nose and very tip of the brows.

also u could blend in the dark lines of the upper and lower lip a bit to make it look more solid

Thanks for the advice much appreciated, not sure if its my computer though but on the iphone the highlights look alot brighter where as here they look greyed out a lot more

I get the same thing sometimes, and varying results depending on which computer I use. The bright highlight across the bottom jaw looks fine, IMO.

Alright Jack wasn't THAT scary! Nice one!