You're on your way, but you have a lot more work. Like you said in your first post, it still looks like a box and some pvc pipe. You want it to look like it's all one, functional piece. People should be saying "hey cool jetpack" not "is that a jetpack?" If they have to ask, you did it wrong.
Make your thrusters look like they're actually thrusters. Right now it looks like they serve no purpose.
You should add more body to the pack. By this I mean add more bulk to the pack on the sides to cover up those fuel tank pipes. Cut those down while your at it and add something to the top of them even if it's just to seal them off.
The middle pipe looks like it wants to be a missile, but it's never evolved from pipe form. Either take it all the way, or ditch it.
You can do it! You've got an awesome base and you've put in the hours and effort to give yourself the perfect launching platform for an awesome pack!