The only illustration in the Origin of Species is the following sketch of the tree of life by Charles Darwin:

More recent tree of life is given by

On this tree all multi-cellular organisms are a tiny branch in the forest of bacteria and archaea.
Ref: [1] http://www.nytimes.com/2016/04/12/science/scientists-unveil-new-tree-of-life.html?_r=0
[2] https://whyevolutionistrue.wordpress.com/2016/04/13/the-newest-tree-of-life-many-new-groups-all-bacteria-some-cryptic-and-enigmatic/
[3] http://www.nature.com/articles/nmicrobiol201648
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About Artem Novozhilov
I am an applied mathematician interested in studying various evolutionary processes by means of mathematical models. More on my professional activities can be found on my page
https://www.ndsu.edu/pubweb/~novozhil/