Whoever did this illustration (and those who created the hordes of other illustrations like it) needs a good flogging.
The artist has basically pasted a thin layer of skin onto the skull of Rodhocetus, giving it a stretched, hellbeast sort of look.
Why is the hair sparse and patchy? Haven't you ever seen an otter?
Mammals have noses made of soft tissue that progress further than the skeleton would suggest. Why would you draw a protowhale as if it were a squamate relative?
Why is the belly truncated and shapeless? Mammals usually have an s-shaped sternum-to-pubis contour, what about Rodhocetus suggests otherwise?
Well, at least it's not as bad as this rendition, which looks like a sprawling scaleless crocodile with a mysterious absence of neck muscles.