I like how the flock couldn't decide on being a guy or girl! It kind of brings in the fact that people can choose to be either one, that it's not just something you're stuck with. I've noticed that you tend to use a comma when a period would work better. At some other moments, there should also be an apostrophe to mark possession. It's a fantastic story. I especially like the end where they face the masterpiece. That was sort of a life-changing moment, the part when colours were used instead of black.