IT WORKS! 

Thank you so much @carolhappy for helping me understand the steps to getting the pictures to appear. I realised my mistake: not dragging the image. 

Here is my submission to the Art contest. Sorry that the picture quality isn`t the best, but I tried.

the Baby form is the one beside the egg. 

The juvnile is the top left one and the Adult is the top right one. 

Thank you for looking at my dragon.Have a good day/night! :)