Share this url with your friends to have a chat with paint brush (this app is somewhat broken ) and use Refresh !! to update your paint screen with other users. Read about Paint chat. It may happen that after some time what you are drawing is not available on refresh, probably caused to file-size limit, you may try clearing screen then.
Here is some of work by viewers that i was able to capture in shared mode. If you wants one of yours here too... mail me the screenshot at aburad [@] gmail [dot] com.