this model's Bodyline is nice form!
But armature is incomplete structured,cause of that,it is difficult for pose it.
.I wonder if this model could move correctly...
I think you study seting armatures,then,your model can be better than now.
I downloaded this model and loaded it into blender. My goal is to put the model into T position. Howcome your models aren't in T position ready for animation with Mixamo autorigger. (free if you have an adobe id).