Hi Felix, is it for presenting to clients?

Screenshots like those you made are often enough to get the general Idea.

But if you have a personal interest in rendering it's another story!,
I find texture mapping to be one of the most tedious aspect of rendering, especially with wood.

Sometimes just "clay" renders without materials does a great job.

If you have a recent Nvidia Card, Octane render is a cheap solution for a physically based renderer, if you want to do uv mapping you will need another software though...
The interface is not too easy at first but it works.

You can also get free Cararra 3d versions in magazines from time to time, I don't know much about it but it supports vertex normals.

Marc