Lovely children. I think that they call for another attempt at this. I'd go for a backdrop that doesn't have creases in it, I'd try and avoid getting the floor in view and I'd straighten the images before posting. I think the images when they are together work better, even if in #1 it seems he is worried about her strangling him. I think the top half of the last one is my favourite because of the children's expressions. I hope that helps.
i agree with the coments above, also try and get a tighter crop on their face
definitely worth a second attempt, the focus doesn't seem right to me so i would watch that. Also if you move the chair / children further away from the background it should blur more so you can't see what it is.