From a silk painting by Kawanabe Kyōsai (1831 – 1889). See discussion.
This week's Japanese word for those who want to practice their calligraphy is kuri to risu (chestnut and squirrel). Reading top down starting from the top right, the characters are written in kanji (kuri--chestnut), hiragana (to--and), and katakana (risu--squirrel).
Here is a relatively simple squirrel and chestnut sketch for practice.