Howdy...
The idea of rendering is very subjective. but for toy design we need to take our thoughtful and detail-filled thumbnails and get them into a form that can be presented. Traditionally most rendering or presentation sketches were finished in marker or guoche (as depicted here in class) but using a vector based digital tool, like the demo, allows us to work fast and output designs in a multitude of ways. Link to the in-class demo files here....or email if you need them sent. More than happy to review work online.
http://www.struk-ture.com/render1.ai
http://www.struk-ture.com/render2.ai