Sculpting the fireplace in Zbrush was extremely fun and intuitive. I tried to add as many details as I could, while also inducing the materials that the objects are made out of.
The wood parts of the fireplace have a lot of details sculpted into them, that I have done without looking at any references.. It was extremely exciting drawing whatever came into my head on the spot.
I also tried to induce the feeling that these forms have been sculpted in wood, with sharp edges around them, just how they would look in real life.
On the marble parts of the fireplace, I tried to give the object but also to the detailing a soft look, with no indents of any sort, looking at reference and seeing that marble fireplace have usually quite perfect surfaces.
The stairs were quite easy to make, and I really like how they ended up looking. I have used the orb brushes that Katarina linked to, but also the techniques that Scott showed us for the indents.
For the skull, I realized that it would be way easier to make a low poly version in max and then work my way to the final result in Zbrush, so that is what I did.