a lot of it is the textures on a mesh

https://www.youtube.com/watch?v=W07H7xeUnGE

just need to watch to time stamp to 4:19.
don't matter what app Andrews using all app's work the same

so if the mesh is not textured the way you need no render engine will give you what you want.

You can bet the meshes ya see in Arnold was textured for Arnold.

you can use any render engine.
some of the Artist here get killer renders with Poser render engines.

can always tweak them with 2D app's n filters.
I like http://www.topazlabs.com/

 

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The Artist that will fight for decades to conquer their media.
Even if you never know their name ,your know their Art.
Dark Sphere Mage Vengeance