If you want to create incredible 3-dimensional lenticular images, the key lies in the depth information.

If you have a picture of a girl with a solid white background and nothing else in the picture, it will be flat and uninteresting. 
Now, if the background is a mountain range with clouds behind it and just behind it, a tree branch and right in front of it, there is text and leaves
on the ground ... ready to jump!

So, be sure to stay away from a lot of solid colors that leave the indefinite element in space. And make sure you 
have enough elements to create a certain separation. With this you will get an amazing 3D image.