The thing is when you convert a Poser scene into any other render app, only the very most basic aspects of a material can be converted without differences.  If your materials are all completely basic, that's fine - if you're using any kind of advanced materials settings, e.g. like pretty much any modern character skin shader, they will be made into garbage.  There is no way to accurately convert materials from one render app to another (not just Poser, any app).  They can be crudely approximated but that's all.  Everything will need some manual attention.

Lighting and composition are certainly important, but having good-looking materials should not be overlooked.

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