This looks great! The contrast between b&w and colour adds to the drama. However, there might be a bit too much contrast. Was the dirt really that colour?
Christoph - It was solid clay and was very orange to start with, but with the OOB-s I usually give the contrast and saturation a hit to add to the "cartoon like" quality! Maybe just a bit heavy handed on this one!!!

Odille - I think there is an action in CS, but I have a link to a step by step - let me know if you need it!