One more note here... the bottom of the rocket should be just below the nape of your neck and the back of the JP should be under the top of your back and collar armor. I think the JP is sitting too high on your back. You can fix this by moving the clips up. I imagine part of the problem could be your height relative to the JP... not much you can do there, but by moving the clips up, you will move the JP down and it will look a little better.
Other than that, it looks great. I think your pants look a little baggie because of your lack of knee pads, but having knee pads should fix that. Also, I think the collar armor isn't so bad. It looks bad in that one picture because there was no back armor attached. It could probably be moved forward a hair, but not significantly. Ditto on the spacing of the armor. It needs to be tighter. But honestly, it all looks pretty great.
Oh, and one more thing... wear the scuba belt around the waist tight. All of the weight of the JP needs to be on your waist, not on your back. The whole purpose of the straps coming out of the back are to just keep the JP vertical. They aren't intended to hold the weight of the JP. I know this because of a Ghostbuster proton pack I have. It weighs 30 pounds and I can wear it for about 4 hours without getting tired, not because my back is strong, but because they weight is held by the waist belt, not the straps.
Looks awesome!