Found a great stock image (at http://mjranum-stock.deviantart.com/) that just screamed to be made into a Riddler teaser poster. Not a great deal of work, just mostly recolouring and adding the background.
I have a few drawing and illustration classes available to view on Skillshare for people who are beginners. These classes are for people just starting out in art and can apply to the photo manip work I do. Click on any of the links to get 2 Free months of Skillshare subscription and start your art journey today!