I dabble in Sumi-e, too - but I don't have any proper training in it, so at best I use some traditional painting motifs or elements to enhance calligraphy works.
This one was actually based on a little "trick". While the actual calligraphy was made by hand, the cat was printed on a plain white sheet using a laser printer, and the washi paper with the calligraphy was glued over it - washi being semi-transparent, the effect looks nice enough.
When two people
This one was commissioned by a friend for a gift to her mother.
The writing is taken from the I-Ching and goes, more or less, like this:
... when two people understand each other
in their inmost hearts,
their words are sweet and strong,
like the fragrance of orchids.
Approximately 9x40 cm.