He travelled a good deal in his own country as well as elsewhere in Europe and the East, and produced a considerable number of views.
As a painter, Coignet holds a middle place between the Idealists and the Realists, and his work is remarkable for the combination of vigour and delicacy in the effects of light and shade, for poetical feeling, for a firm brush, and occasionally for grandeur of conception.
One example is the coastal sunset in the Louvre;[2] another is the pastel "Grey weather over the sea" (1848) in the Dijon museum.
In fact one of the minor members of this school, the genre painter Ferdinand Chaigneau [fr], was a pupil of Coignet's.
In addition to producing many water-colours, pastels and etchings, he wrote a book on landscape painting and published in 1825 a series of sixty Italian views.