Seconded on the ammo vats, they're great. I like how you've incorporated the theme into the rocket launcher, with only three tubes loaded and in the shape of the Nurgle symbol! Quite pleased I spotted that since I've only just got out of bed.
It looks like the flash is washing things out a bit- it's best to use natural light and leave the flash off but that's easier said than done if you're a Brit at the minute.