Is this artist's depiction of a multiverse accurate? If such a thing exists, what would it REALLY look like based on what we know?

It's impossible for us to comprehend the true "shape" of the multiverse (if it exists). Our perception is limited to three spatial dimensions plus time; and if any of the various string theories is correct, then we can't even perceive our own universe in its true multidimensional form. Any illustration of the multiverse has to be an extreme oversimplification, since it attempts to compress the various dimensions of each universe (perhaps 10 for our own), plus whatever dimensions are needed to express "distances" between the various universes, into only two dimensions.

We can never be sure whether or not it's accurate. For example, how do we know there are multiverses at all? Perhaps if other universes exist they do have different shapes, but would it be easy to see their shapes?

Where would the light be coming from to reflect from their outlines? All of it is speculation. Don't get me wrong on this, it's really interesting trying to think about all the possibilities, but if the furthest that humans have been able to go to is the moon and the furthest that a spacecraft has gone is just outside the solar system, we still have a long way to go until we can make solid conclusions about these things.

Actually it is somewhat inaccurate because it is believed that universes can have different shapes. For example, our universe have been described as being doughnut shape for some reason.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.