Haii hello(^_^♪) I think the values are messed, so i tried to fix them, i found what i think was your reference and tried to adjust values to it. Also your shadow were warm, felted dirty and plain. USUALLY(!) if the light is in warm tone, the shadow will be cold,it works the other way around too. Your shadow was already really dark, but it doesn't had depth in it, so i recommend to lighting up some parts that are closer to the surface(and do that with light too) I felt like you wanted to pay attention to the fact that character doesn't have a hand/the hand replaced by strange thing, so i recommend you to move character a little bit to the side to express it and also give some space. Also just an advice for composition artists usually don't place the main parts in the center, especially when it has uncommon shape Hope this was helpful!!♡´･ᴗ･`♡