Awesome detail
While this might not be the most concise piece when it comes to the details you've given us, you certainly have provided a wonderful image here of Space Marines about to get overwhelmed by Genestealers. The amount of arms looks daunting and from the point of view of the space marine, it probably would be, if he could feel fear.
The little details really make this piece - the skulls on the space marine belts looking scared and / or confused, though I would have liked to see a pilot light on the flamer that was surprisingly not used. Mind you, if you're showing the turn-based nature of this game, he wouldn't be aiming, just praying that they don't kill him before he gets a turn to burn, though it should still be alight. (I had a vague brainwave about a genestealer walking up to a flamer marine and offering him a cigarette lighter, to get the pilot light going again - that would be funny, if done right.
The shadows make the detail of the picture a little difficult to perceive around the edges and the obvious "Games Workshop" trait of making all of the models look highly similar is still well documented, though it probably sped the project up by a few days, or even weeks. If I'm brutally honest, I think that you've not put enough into the background, since these space hulks have been abandoned for ages, so have probably become dirty, rusty and the like over that time. A little more ageing would benefit muchly.
[Review Request Club]