the guy is so scary, great work .
I'm at the beginning of character design, but i try to describe my impressions.
The position of both arms feels not right. I think, the hand with the head has to be placed behind the leg and the other arm should be place further forward. Think of your posture when you are walking.
The focal point are the tattoos, because they are sharp. In my opinion, every first look in a character design should be the face.
Here are some additional advices: