On another look, I see you've already created multiple topics. Let me delete these for you, as you can only have one active entry.
This is your Art War topic. You will need to post your progress images - sketches and WIPs to this topic. On bottom right there is "REPLY" button, when you press it will allow you to make a reply in which you can share your progress.
When you have the final images, you can post them into the same topic as your progress sketches and press "Submit Entry" button.