Hey Razz, good stuff as usual. Incredible pics from your trip. Those are the type of shots that leave me wanting to do some terrain work – the desire passes quickly, but they’re remarkable enough to trigger the impulse! 
Your concept sketches are very crisp and have that ‘easy to translate into 3d’ quality that they should. It’ll be interesting to watch your work develop in that area. Lots of people try it, but so many miss that critical functionality.
Texture: A great tip I took from someone on Polycount recently was to really focus on your specular map when working on metal. Only the most gross discolurations will really show up in the diffuse (rust, major scratches, etc) and the vast majority of the detail will come through in the spec. Now you have plenty of those very big discolourations in your hammer (rust, heavy scratching, etc), but you willing likely get a more clear diffrentation between handle and head with a well crafted specular map.
Just starting to study this stuff myself. Very interesting topic and it really forces you to think through how materials work etc.
Thanks for the comments in my thread, always nice to have a talented hand such as yourself comment on progress 