hrmm
the point of an 'image' such as this, is to imitate two eyes looking at the same thing, which when you think about it, is quite simple to understand. your eyes are nearly directly next to each other, no vertical changes, while having very little horizontal change. however what does change, and what makes this kind of image challenging is the angle.
if you can, put a grid on the camera you are using, and a book underneath the camera so that the heigth doesn't change, and with a grid, make sure the subject is always in the same part of the grid. hopefully that helps to better your sucess of this type 3d illusion, also though, newgrounds really isn't a place for tests, heh.
^^ good luck.