After resolving a screenshot dispute, I thought I'd mention some general policy that we'll document later in the FAQ:
We generally don't accept more than 30 screenshots per game. You don't need more than 30 shots to properly represent a game.
Also, all screenshots must have a meaningful description, not just "ingame 1", "ingame 2", etc. If it's not painfully obvious what we're looking at, it needs a decent description. And blank descriptions are not accepted.
Finally, screenshots can't give away the ending of the game. These are "spoilers", because they spoil the game for people who haven't played it yet.
If you disagree with these policies, email us to offer your suggestions.