He was in his late 40s and 50s when Impressionism came on the scene, though freely-brushed paintings had appeared before then. In any case, Stevens, whose favorite subjects were elegant women, was a painter quite capable of working in both tight and free styles. I hadn't given this any though until I noticed the following painting on the Internet.
Stevens was in his early 40s when he did this. The woodsy background is dark, but not painted very tightly, as is so for the foreground subject.
An interior scene painted when Stevens was about 50. Tightly done: notice the fabric detail on the dresses.
The famed actress took painting lessons from Stevens when he was in his early 60s. In return, he painted her several times. Here most of it is painted in a rather feathery brush style, sharpened here and there. Interestingly, the more tightly-painted fan seems more the main subject rather than Bernhardt's face. (But yes, we are still drawn to her eyes.)
This is done in a free, almost sketchy manner. Something like the sea background in the first painting.