Maybe instead of asking, "How can I provide you with assistance?" after tearing someone down, try offering constructive criticism. It's also common courtesy to wait until someone asks before offering; you come off as an egotist, making it sound like they *need* your help.
Its more that the polygons are too apparent like youre zooming into something so you see imperfections clearer. Itll depend on how the models are handled. Not sure if unreal deals with blenders shape keys but it shouldnt be that bad to modify and replace all the models if you just give the belly more polygons.
I would offer help modifying or remaking these models though.