One way I practice my drawing is by copying work from my favorite illustrator: Gyo Fujikawa. It helps me see things differently and to try to imagine things as she saw them. I particularly love her pen and ink drawings and flip through them when I'm looking for inspiration for my practice.
Here's a few I did a while back. The acorns and ice cream cone are replicas of her ink work and the sundae is a pen and pencil rendering of one of her painted illustrations. All three of the originals are found in Gyo Fujikawa's A to Z Picture Book.