Several things spring to mind as probable causes...

Lights.  Default lights are horrible, don't ever use them.

Shader setup.  Skin shaders are notoriously difficult to get looking ok without a lot of headaches.  The default shaders supplied with DAZ's figures are not great.  Many people here use and recommend BagginsBill's VSS, which gives superb results when used with an appropriate light setup.

Gamma correction.  This is a whole can of worms in itself but there are a lot of users who use some form of GC and can tell you how to set it up to get the best results.

I confess all the above are beyond my scope to instruct on but there are many others here who can point you in the right direction.

Coppula eam se non posit acceptera jocularum.

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