Thanks for all the nice comments
Here is a new update and the last one before I'll upload the final picture
I'm pretty sure almost no one will know this guy although most of you have certainly seen him before
This is Thomas Kretschmann, a german actor. Aside from many appearances in television he also was part of many movies, such as 'King Kong' or 'The pianist' (and he was a big bad in '24'
Unfortunately I haven't found a good reference, so I have to make the best out of what I got.
tools: the usual suspects (pencils from B to 8B, eraser pencils, tortillon ...)
time: no idea