here -- almost nothing there, as you can see.
Nevertheless, he painted many portraits, a number of which can be seen here. Note that nearly all are of persons of local or middling national interest. There are no royalty, top-level nobility or senior military leaders shown. Nor are there subjects from the entertainment world.
That said, Rivière (of Huguenot descent) was competent in his work and also painted subjects besides portraits on occasion. Despite his competence, as readers of this blog might be aware by now, he had a great number of British competitors who were equally good, and a few who were much better.
In the Gallery below, a few portraits are presented, then three other works. The latter pre-date the portraits, so I'll conjecture that he tried other subjects before settling on portraiture as a career.
Perhaps his most famous subject: Information regarding Wellcome is here.
I find her pose unusual, but interesting and probably characteristic of her.
At this point in his career Rivière introduces a whiff of fashionable modernist simplification.
Another variation in style.
More a commentary than the portrait this might seem to be.
Perhaps his best known painting.
Another interesting work, but apparently wasn't enough to propel Rivière's career.