The difference is that in the painting Lucifer has only one face.
We can arrive at this answer because:
Dante's Inferno was a text that inspired many artists to produce works about hell and its inhabitants, but these artists showed their own interpretations by modifying some elements.
An example of this can be seen in the illustration by Doré which shows the figure of Lucifer with only one head, while Dante presents Lucifer with three heads.
This shows how even inspired by the same work, people can produce other artistic manifestations, adapting them and promoting new information and perceptions.
More information about "Dante's Inferno" at the link:
