That has been my greatist improvement last year, upping the overall exposure time on a single object from 60-90 min to 3-6 hours. Indeed it opened up the world for me.
Never the less, the shots are still nice, especially Thor's helmet. The other 2 seem to need some more exposure in order not process them them as hard. (Which me also just be my very old on loan laptop, as my astro Acer decided to die on me, well the NVidea 8600M video card actually, all the data is save however. Never let your kids on the laptop wit lemonade around, duh. New one (core i7, 8GB RAM, 2048MB Nvidea videocard, 640GB HD) is on the way.