I think we are agreed that the illustrations by Phiz for the third monthly number are decidedly underwhelming. Rokujo Lady mentioned two later illustrators of TOTC (thank you!) and I thought it would be interesting to compare their efforts with those of Phiz.
The first image is by Fred Barnard from the 1870s for the Household Edition (scanned image and text by Philip V. Allingham). Interestingly, http://www.victoriaweb.org (the site I took the images from) claims that Barnard didn’t want to compete with Phiz’s fountain scene and so instead depicted the Marquis discovering he has a stalker.
The second image is by A. A. Gill for a 1905 edition (scanned image and text by Philip V. Allingham), which reproduces the same scene as Phiz but focuses on anger rather than grief and zooms in on Gaspard, with the Parisian poor huddling as an undifferentiated mass in the background.