It seems you’ve got the overall gist of the lighting down.
Whenever you’re unsure about lighting, the best thing to do is to shoot your own reference photos. You have various lights in your home, so use them. If you don’t have one, a portable/articulated light source is great for shooting references, because you can position the light however you like. Add a mirror and tripod (or something that can be used like a tripod), you can even use yourself as the model and shoot lots of used reference photos. Family and friends can help you too with modeling or shooting or providing clothing that somewhat matches what you’re going for. In this case, the “samurai pants” you need can be approximated with other clothing or towel or sheets. Then just get a light source above the person and you’ve got the reference you need.
As for emotions, if he’s supposed to look shocked, then you need to make sure his facial expression really sells that emotion effectively. Again, shoot references, or search for “shocked emotion” images on the web. Eyes should be bulging from the shock, eyebrows tense, nasolabial folds prominent, mouth agape, etc.
If you want this to be a full scene of narrative with all those dead bodies, you need to plan the composition from the beginning that way, instead of adding those other elements as an afterthought. Compositions can’t be done like that–you need to plan them starting from the thumbnail sketch stage, so you’re balancing all the elements in your visual narrative effectively from the get go.