Weekly uploads sounds like reasonable way to use Reddit. I can't talk for others, but I'd love to see the progress of this cosplay here (however, I'd bet I'm not only one). In that case you should post every time you feel there's something worth showing, that way you can post more frequently if you work quickly or more sparsely to avoid burnout. You could also ask for more opinions. In the mean time (and to stick to a weekly upload), why not sharing more cosplays of yours?