body too small/skinny, ams too big, looks weird.
All fair, I mostly draw still lifes and portraits. Haven't dabbled into poses, figures or anatomy yet. This was mostly from memory too. Only way to get better is to make mistakes. Honestly, I don't fully understand how people design their OCs from memory without making multiple mistakes. They must have studied a lot or are more talented than me.
Edit: Looking at it carefully I think I made the arms too thick. They are kind of variable depending on if they are super charged or not, but normally they are thinner. Also the body is not perfectly symmetrical and the brain is good at detecting that.