In the long run, the quality of your work is all that matters. That is your only resumé. Be professional. Make sure your editor or publisher can always reach you. Do what's asked of you if your conscience can bear it. But know that, five years from now, as fans or prospective employers are looking over your published pages, no one will care that this story sucks because the publisher moved the deadline up or because the editor made you work an android cow into the story. All they will care about is what they see in front of them, and they will hold you responsible for it, no one else.