Boldini's Wikipedia entry is here, and includes a large number of images of his work. Like in the Gallery below, they are arranged in approximate chronological order.
An example of Boldini's mature style. For background on Cléo, click here.
Painted when Boldini was about 23 years old. Very conventional.
Another conventional portrait, its date is unknown.
Martelli was a fellow artist. I saw this sketchy portrait at the Pitti Palace in Florence several years ago.
A more conventional work from about the same time. Boldini was quite capable of making traditional paintings, unlike many later modernists.
Here he shifts to a more thickly painted style where everything seems heavy.
A few years later he lightens thing up somewhat.
From about the same time. His brushwork is becoming much more evident.
During the late 19th century there was a mini-fad for 18th century court scenes such as this. I wonder if Boldini painted this and a few similarly-themed works to cash in on that fashion.
Here Boldini brings in Spanish-influenced blacks, something he used in a number of later works. The feeling of this painting is coming close to his mature style.
This seems to be a sketch or study. I include it to show that he was experimenting with square-brush technique, an approach later used more consistently by the likes of Leo Putz.
I'm not positive the date is correct (one has to be cautious of what finds on the internet without corroboration). If it was painted in 1878, this sketchy work comes close to Boldini's classic style.