Lumagrowl is the hardest, I figured out that you have to make sure the flap on the tail is down though and the arms are folded up, or it won't close.
No I got it now, the neck wouldn't bend backward so I had to force it and "snap" its neck. Otherwise I had it right and its easy. Its just the neck wouldn't go back so I can fold the head up. Dharak had the same problem but I snapped him already.