Ok, nice pics, but there is an issue, this is tip cavitation created in a cavitation tunnel with no flow disturbance due to current, flow distortion from a hull, etc. Plus, these tests were designed to produce stream cavitation at the tip- so they got what they wanted. These are not tests to see what happens under any conditions, but carefully controlled experiments.
First go here:
http://metocph.nmci.navy.mil/KBay/backgroundnoise.htm
Lookat the diagram of sheet cavitation and also remember the bubbles are disturbed from the perfect streams in your picture by the flow of water being affected by a number of variables.
Also, pressure changes the characteristics of cavitation and where it appears on the blade-i.e. depth.
You can have tip cavitation, sheet cavitation, or cloud cavitation occuring on a propeller.
Here's a basic reference:
https://www2.hcmut.edu.vn/~dmthien/course/lythuyettau2/w11(suc%20ben%20xamthuc)/cavitation.pdf
What the pictures you posted and most things you find on the web do not deal with is the effect of shear forces created by unsteady flow disturbing the path of the cavitating buubles. Such forces create local changes in pressure that can cause the collapse or expansion of cavitation bubbles and will also mix the bubble streams, which, especially in the case of cloud cavitation, causes the effect you say is not realistic.
Here's a pic from a CFD analysis around a nuke submarine which has less flow disturbance created by the hull than a WW2 sub. Even this pic does not illustrate the disturbance from ocean current, wave action, etc.
