The colors are accurately reflecting the environment, which is excessively blue. One obvious approach is to make the environment less blue.

But I assume you wish to keep it that way.

Well - it follows simply enough - don't use the environment dome for the lighting.

Turn off "Light Emitter" on the env sphere or dome.

Now add an IBL that is more to your liking.

There are a few posters here who are confused about IBL + IDL and incorrectly tell people to never use these together. Remember, many people post with certainty and conviction while remaining utterly unclear on certain things.

It (IBL) works EXACTLY the same as a source of diffuse light. The only difference is when you use the IBL as your light source, you can't "see" it in the camera or specular reflections - you only see it in the effect it has on your diffuse lighting.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)