Marc, really that surface only seems to be there in the pics. It cannot be seen if you see the figure directly. Perhaps the pics magnify this effect. I think it must be related with the prime spray I used.
Either the white metal had small holes in it over that part which could be fix with a putty or your primer slightly ruined the smooth surface! If it ever happen with the primer simply brush it with toothpaste and a toothbrush under running water!
Otherwise really nice job! The tone of the face are impressive and the grey of the coat convincing. I would sligthly push the contrast further though especially on the grey! Keep up the good work!
Rafa,
I have to agree with Marc, the sash is nice. I think your gray looks very good as well. As Mortarion mentioned, maybe just a bit more highlight and it would be perfect! Keep us posted!