Hi, Bray.
The lighting looks like it is believable, but you should see if you can find as similar a reference as possible. The perspective lines look off on the dinner table, chair with the knife stuck in the seat, and the top of the impaled man's chair. The dead man in the back corner has oddly short legs in relation to his upper body. The man with the drink looks like he is sitting on the corner edge of his chair facing the corner of the room diagonal from him, which is odd. The seated dead man's right arm looks weird where the deltoid connects to the bicep and the tricep below. Reference a similar posed arm. It would add a little more visual interest to draw the knife in the chair in a different perspective. It looks just like the sword in the forefront and suggests you struggle with foreshortening.
Work on all of that and this could be a great piece!
