Wow! You are doing an amazing job!
Not wishing to take anything away from your great work but one thing that looks a little wrong at this stage is the right arm and hand. It appears to have too much life in it. This guy is meant to be dead isn’t he? In David’s painting you will notice that Marat’s right hand reaches the floor and it is this compression of the fingers that helps to keep the quill in his hand, in my opinion. As you currently have it, in your sculpt, I believe the quill would fall to the floor. Perhaps you could raise the floor or straighten his forearm a little?
Keep up the excellent work. 


… it’s really looking nice - perhaps breaking up the parallel lines indicating the bones on this hand would add more… make one of them stick out less or sth… now they look just like 3 lines at equal intervals… very delibarate 











