> Could you try also with radiosity? Now your test image lacks global
> illumination which contributes a lot to realism. Also the shadows seem
> to be way too sharp considering the size of the emitting ball.

Here's one with a little bit better radiosity... high quality settings
take a lot of time, these are medium settings. (26m)

> I also noticed caustics that can be seen below the green refractive
> sphere. They came from reflections from the big yellow sphere. I guess
> in POV you have to tell POV where to shoot photons? So you might also
> miss these kind of effects?

Depends on what you mean by miss... you have control in POV to
omit them if you want to. It's a different way of doing it.

> To my eye, my image looks more realistic but I'm a bit subjective to say
> it :-)

It's easy to miss the artifacts in any good image... for example where
your red and yellow spheres have a bit of hall-of-mirrors the color
fading into the distance is uneven, which is caused by the unbiased
methods, but would eventually resolve. Or the sharp edges on the
highlights seems a bit harsh, sort of like unintentional lens flares...
another artifact that your mind subconsciously ignores.

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