Suana, I love your work!
I agree with everything Artemesia said, although you might also include those puppets with the children's illustration - they are really delightful. Also, you don't say how widely you have sent out your samples; it's hard to know who will respond, so I'd suggest sending your work out as widely as possible, to both ADs and editors (if you haven't already). That can get expensive with samples, so it might be easier (and cheaper) to send out a knock-their-socks-off postcard every six months or so. I don't think you need to be more creative than that - your work will speak for itself.
Best of luck to you -