Going to hand out my usual advice - and it always holds true sooner or later. Go do some life sketches - that is, stop drawing from imagination from imagination for a bit and start observation. See that handy hand of yours? Draw it. You now know how to draw a hand.
You've got to know the rules before you can bend them. Your lighting isn't too bad, but for a style that incorporates a load of "realistic-ness" into itself, certainly lacking the basics of a real style.
Not too bad for a start though, man.