I'm not sure when to give a physical description of my main characters. With all the other characters, I describe their appearance when I first introduce them. But briefly, so it's not an infodump/filler. Unfortunately, I couldn't make this approach work for my MCs. I tried, but it just felt forced. So instead I've sprinkled references to their descriptions throughout the text ('there were bruises on her small body' 'her curly hair was wet,', etc.). I know this isn't a case of 'one size fits all' and different approaches work better for different people. I'm a very visual person, and I enjoy describing my characters, but I want it to fit into the story and not seem like fluff or filler.