The magic trick

I have one of those tables with a lamp inside, but I wasn't using it with the other sketches cause I was copying directly from my computer and I don't have that table in the same room. This time I printed John's drawings and I went to my other room to draw them. After drawing them I turned the paper and I looked at it from the other side and BLAM! a lot of the mistakes became apparent to me. So I copied those again in the other side of the paper, using the construction of the first drawings that I saw through the paper. Now I apply Flip Canvas Horizontal in Photoshop and compare...
Ok, they are still not quite perfect, but at least I think they look pretty decent on themselves...Mainly I shouldn't have changed the neck of the second one and the mouth is still a bit too big, but the rest of the drawing I think I got it quite better when I turned the paper.The first one is more exaggerated in general.