A Reinhard based tonemapping I recommend

[B4uti4github]

I've done a tone mapping that looks like this: n/(n+exp(n/(n+1)))
This uses Euler, something that is widely used for natural products, and I've done a small test and look how it looks:

What do you think, would you add it? I think it looks more natural than the classic Reinhard. It's based on Reinhard.

[B4uti4github]

Another example:

[B4uti4github]

It's like the image in the upper left corner of the room looks more intense in the classic version and more natural in the e-reinhard version.

[B4uti4github]

This is another exr test, and it's multiplied by 6 the exr colors: