I learned a few things while making these monoprints. First, you need to just play and make a whole bunch of prints! I printed on fabric, paper, and old book pages. You'll find that amongst all those prints, will be a couple that you really like.
I also learned that I loved the edges of the prints, where you see the registration (or most likely missed registration) and layers of color. And I learned to leave plenty of space around the print.