And if Dalek can't help you (judging by his vector work, it's unlikely that he can't), visit a certain link in my sig. It was built up as a tutorial community (although we're in the process of a radical branching out period). Pretty much everybody there knows Photoshop like the back of their hand. If you're really keen to learn about graphics, we also know enough about Cinema 4D to keep you occupied for several months.
This work is very good Dalek. The face is an excellent effort and would only require a slight bit of modification for it to look "right". I suggest you fix his lips a bit. The Tardis was probably the easiest thing to do given it's shape. Great stuff, keep them coming.
(PS - I'd be interested in seeing a tutorial which we'd upload to Good Tutorials for you. Let me know if you're interested.
)