If it looks complete, i.e. has all the frames that one would generally expect given the sprite in question. I mean sure, if it's missing a couple of special rarely-seen frames then we might not notice, but if there's only half a walking cycle or a character is missing an animation they should obviously have, that's clearly not acceptable.
If we don't know the game it's totally possible that we'll judge it incorrectly, but in that case we'll ask the submitter. We can't 100% moderate this but we trust people to follow our guidelines. If an incomplete sheet gets through, people who notice can point it out.
While we don't want incomplete sheets on the site (especially something like 55%), you're totally free to post WIP stuff on the forums - in fact we encourage it! People can see what you've done, give feedback or tips, and maybe even help complete it.
If we don't know the game it's totally possible that we'll judge it incorrectly, but in that case we'll ask the submitter. We can't 100% moderate this but we trust people to follow our guidelines. If an incomplete sheet gets through, people who notice can point it out.
While we don't want incomplete sheets on the site (especially something like 55%), you're totally free to post WIP stuff on the forums - in fact we encourage it! People can see what you've done, give feedback or tips, and maybe even help complete it.